Wi-sun Address registration update:

Enable address registration if learned new address after bootstrap
phase.

Start registation when RPL indicate paren't updates.

source/6LoWPAN/ws/ws_bootstrap.c

@@ -126,7 +126,10 @@ static void ws_bootstrap_address_notification_cb(struct protocol_interface_info_
     }
 
     if (reason == ADDR_CALLBACK_DAD_COMPLETE) {
-        ws_bootsrap_event_trig(WS_ADDRESS_ADDED, interface->bootStrapId, ARM_LIB_LOW_PRIORITY_EVENT, (void *)addr);
+		//Trig Address Registartion only when Bootstrap is ready
+        if (interface->nwk_bootstrap_state == ER_BOOTSRAP_DONE) {
+            ws_bootsrap_event_trig(WS_ADDRESS_ADDED, interface->bootStrapId, ARM_LIB_LOW_PRIORITY_EVENT, (void *)addr);
+        }
     } else if (reason == ADDR_CALLBACK_DELETED) {
         // What to do?
     }
@@ -1194,6 +1197,9 @@ static void ws_bootstrap_rpl_callback(rpl_event_t event, void *handle)
          *
          */
 
+    } else if (event == RPL_EVENT_DAO_PARENT_SWITCH) {
+        tr_info("RPL parent update ... register ARO");
+        ws_bootsrap_event_trig(WS_ADDRESS_ADDED, cur->bootStrapId, ARM_LIB_LOW_PRIORITY_EVENT, NULL);
     }
     cur->ws_info->rpl_state = event;
     tr_info("RPL event %d", event);