Add #if condition to .S method call

Author: Max Vilimpoc

startup_example.S.txt

@@ -170,8 +170,10 @@ Reset_Handler:
     LDR     R0, =nrf_reloc_vector_table
     BLX     R0
 /*
+#if DEBUG_ISR_STACK_USAGE
     LDR     R0, =fill_isr_stack_with_canary
     BLX     R0
+#endif
 */
     LDR     R0, =_start
     BX      R0