qcacmn: Change default log level for serialization

Change default log level of serialization to QDF_TRACE_LEVEL_ERROR
Change error print to debug, when pending queue is empty,
which is a possible expected case.

Change-Id: I21cd6b5f158d5dffbc6e7309c9202e7e2e0162e8
CRs-Fixed: 2387017

umac/cmn_services/serialization/src/wlan_serialization_non_scan.c

@@ -260,7 +260,7 @@ wlan_ser_move_non_scan_pending_to_active(
 	if (!qsize) {
 		wlan_serialization_release_lock(
 			&pdev_queue->pdev_queue_lock);
-		ser_err("Pending Queue is empty");
+		ser_debug("Pending Queue is empty");
 		goto error;
 	}