Remove unnecessary call to mac (#1583)

Remove additional call to mac_helper_devicetable_set.

Author: Arto Kinnunen

source/6LoWPAN/Thread/thread_router_bootstrap.c

@@ -361,7 +361,6 @@ static void thread_router_synch_receive_cb(int8_t interface_id, mle_message_t *m
             //Free Response
             mle_service_msg_free(messageId);
             entry_temp->threadNeighbor = true;
-            mac_helper_devicetable_set(entry_temp, cur, llFrameCounter, security_headers->KeyIndex);
             entry_temp->short_adr = shortAddress;
             //when allocating neighbour entry, use MLE Frame counter if present to validate further advertisements from the neighbour
             entry_temp->mle_frame_counter = mleFrameCounter;