bsps/riscv_generic: Rename and add variants

Add BSP variants to match supported RISC-V ISA variants (multilibs).

bsps/riscv/riscv_generic/config/rv32i.cfg

@@ -2,6 +2,6 @@ include $(RTEMS_ROOT)/make/custom/default.cfg
 
 RTEMS_CPU = riscv
 
-CPU_CFLAGS =
+CPU_CFLAGS = -march=rv32i -mabi=ilp32
 
 CFLAGS_OPTIMIZE_V ?= -Os

bsps/riscv/riscv_generic/config/rv32iac.cfg

@@ -0,0 +1,7 @@
+include $(RTEMS_ROOT)/make/custom/default.cfg
+
+RTEMS_CPU = riscv
+
+CPU_CFLAGS = -march=rv32iac -mabi=ilp32
+
+CFLAGS_OPTIMIZE_V ?= -Os

bsps/riscv/riscv_generic/config/rv32im.cfg

@@ -0,0 +1,7 @@
+include $(RTEMS_ROOT)/make/custom/default.cfg
+
+RTEMS_CPU = riscv
+
+CPU_CFLAGS = -march=rv32im -mabi=ilp32
+
+CFLAGS_OPTIMIZE_V ?= -Os

bsps/riscv/riscv_generic/config/rv32imac.cfg

@@ -0,0 +1,7 @@
+include $(RTEMS_ROOT)/make/custom/default.cfg
+
+RTEMS_CPU = riscv
+
+CPU_CFLAGS = -march=rv32imac -mabi=ilp32
+
+CFLAGS_OPTIMIZE_V ?= -Os

bsps/riscv/riscv_generic/config/rv32imafc.cfg

@@ -0,0 +1,7 @@
+include $(RTEMS_ROOT)/make/custom/default.cfg
+
+RTEMS_CPU = riscv
+
+CPU_CFLAGS = -march=rv32imafc -mabi=ilp32f
+
+CFLAGS_OPTIMIZE_V ?= -Os

bsps/riscv/riscv_generic/config/rv64imac.cfg

@@ -2,6 +2,6 @@ include $(RTEMS_ROOT)/make/custom/default.cfg
 
 RTEMS_CPU = riscv
 
-CPU_CFLAGS = -mcmodel=medany
+CPU_CFLAGS = -march=rv64imac -mabi=lp64
 
 CFLAGS_OPTIMIZE_V ?= -O0 -g

bsps/riscv/riscv_generic/config/rv64imafdc.cfg

@@ -0,0 +1,7 @@
+include $(RTEMS_ROOT)/make/custom/default.cfg
+
+RTEMS_CPU = riscv
+
+CPU_CFLAGS = -march=rv64imafdc -mabi=lp64d
+
+CFLAGS_OPTIMIZE_V ?= -O0 -g