[bsp][nrf52840]Add segger rtt function (#6460)

* fix project to AC6

* add the segger_rtt function

* move Kconfig

bsp/nrf5x/nrf52840/board/Kconfig

@@ -28,6 +28,11 @@ menu "Onboard Peripheral Drivers"
         bool "Enable JLINK TO USART (uart0|RX_PIN:8|TX_PIN:6)"
         default y
         depends on BSP_BOARD_PCA_10056
+        
+    config BSP_USING_SEGGER_RTT_CONSOLE
+        bool "Enable SEGGER_RTT to console"
+        select PKG_USING_SEGGER_RTT
+        default n
 
     config RT_BSP_LED_PIN
         int 

bsp/nrf5x/nrf52840/board/board.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2021, RT-Thread Development Team
+ * Copyright (c) 2006-2022, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -65,9 +65,15 @@ void rt_hw_board_init(void)
     rt_hw_uart_init();
 #endif
 
+#if defined(SEGGER_RTT_ENABLE)
+extern int rt_hw_jlink_rtt_init(void);
+    rt_hw_jlink_rtt_init();
+    rt_console_set_device("jlinkRtt");
+#else
 #if defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE)
     rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
 #endif
+#endif
 
 #ifdef RT_USING_COMPONENTS_INIT
     rt_components_board_init();