netdev: add NETDEV_EVENT_FT_ROAMED

FT is now driven (mostly) by station which removes the connect
callback. Instead once FT is completed, keys set, etc. netdev
will send an event to notify station.

src/netdev.h

@@ -50,6 +50,7 @@ enum netdev_event {
 	NETDEV_EVENT_RSSI_THRESHOLD_HIGH,
 	NETDEV_EVENT_RSSI_LEVEL_NOTIFY,
 	NETDEV_EVENT_PACKET_LOSS_NOTIFY,
+	NETDEV_EVENT_FT_ROAMED,
 };
 
 enum netdev_watch_event {

src/station.c

@@ -3129,6 +3129,8 @@ static void station_netdev_event(struct netdev *netdev, enum netdev_event event,
 	case NETDEV_EVENT_PACKET_LOSS_NOTIFY:
 		station_packets_lost(station, l_get_u32(event_data));
 		break;
+	case NETDEV_EVENT_FT_ROAMED:
+		break;
 	}
 }