Avoid link error from using ASM

When linking, get errors about undefined references
to `SEGGER_RTT_ASM_WriteSkipNoLock`

Author: henrygab

cores/nRF5/sysview/Config/SEGGER_RTT_Conf.h

@@ -84,13 +84,15 @@ Revision: $Rev: 17066 $
 #endif
 
 #ifndef   SEGGER_RTT_PRINTF_BUFFER_SIZE
-  #define SEGGER_RTT_PRINTF_BUFFER_SIZE             (64u)    // Size of buffer for RTT printf to bulk-send chars via RTT     (Default: 64)
+  #define SEGGER_RTT_PRINTF_BUFFER_SIZE             (64u)   // Size of buffer for RTT printf to bulk-send chars via RTT     (Default: 64)
 #endif
 
 #ifndef   SEGGER_RTT_MODE_DEFAULT
   #define SEGGER_RTT_MODE_DEFAULT                   SEGGER_RTT_MODE_NO_BLOCK_SKIP // Mode for pre-initialized terminal channel (buffer 0)
 #endif
 
+#define   RTT_USE_ASM                               (0)     // defaults to 1, results in link error ... undefined references to `SEGGER_RTT_ASM_WriteSkipNoLock`
+
 /*********************************************************************
 *
 *       RTT memcpy configuration