qcacmn: Reduce log level for stats message

Reduce log level from error to debug because a stats event can be
received unsolicited.

Change-Id: I11f3800594c6d623e72a214d832caa29666565a8
CRs-Fixed: 2466944

umac/cp_stats/dispatcher/src/wlan_cp_stats_mc_tgt_api.c

@@ -849,7 +849,7 @@ QDF_STATUS tgt_mc_cp_stats_process_stats_event(struct wlan_objmgr_psoc *psoc,
 		tgt_mc_cp_stats_extract_station_stats(psoc, ev);
 
 	else
-		cp_stats_err("No pending request");
+		cp_stats_debug("No pending request");
 	tgt_mc_cp_stats_extract_cca_stats(psoc, ev);
 
 	return QDF_STATUS_SUCCESS;