board_common:Add BOARD_INDICATE_ARMED_STATE

   This adds an optional default support for HW that does not
   have and external armed indiction.

src/drivers/boards/common/board_common.h

@@ -316,6 +316,14 @@
 #  endif
 #endif //
 
+/* Provide an overridable default nop
+ * for BOARD_INDICATE_ARMED_STATE
+ */
+
+#if !defined(BOARD_INDICATE_ARMED_STATE)
+#  define BOARD_INDICATE_ARMED_STATE(on_armed)
+#endif
+
 /************************************************************************************
  * Public Data
  ************************************************************************************/