boards/risk-v/litex: migrate to SPDX identifier

Most tools used for compliance and SBOM generation use SPDX identifiers
This change brings us a step closer to an easy SBOM generation.

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>

boards/risc-v/litex/arty_a7/include/board.h

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/include/board.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/include/board_memorymap.h

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/include/board_memorymap.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/scripts/Make.defs

@@ -1,6 +1,8 @@
 ############################################################################
 # boards/risc-v/litex/arty_a7/scripts/Make.defs
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/scripts/gnu-elf.ld

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/scripts/gnu-elf.ld
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/scripts/ld-kernel.script

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/scripts/ld-kernel.script
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/scripts/ld.script

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/scripts/ld.script
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/Makefile

@@ -1,6 +1,8 @@
 ############################################################################
 # boards/risc-v/litex/arty_a7/src/Makefile
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/arty_a7.h

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/src/arty_a7.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/litex_appinit.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/src/litex_appinit.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/litex_automount.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/src/litex_automount.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/litex_boot.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/src/litex_boot.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/litex_bringup.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/src/litex_bringup.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/litex_pwm.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/src/litex_pwm.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/litex_ramdisk.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/src/litex_ramdisk.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/litex_reset.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/src/litex_reset.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

boards/risc-v/litex/arty_a7/src/litex_sdio.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/risc-v/litex/arty_a7/src/litex_sdio.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The