qcacmn: Reduce 'no event handler registered' log

Change I9a14a3defc61462bf4c7a8f0278e258603b781c7 moved a log in
wmi_control_rx indicating that a specific event Id has no associated
handler from debug-level to error-level. This resulted in excessive
logging, as the driver has no obligation to handle every event type
received from firmware and very well might not want to handle every
event type received from firmware. Restore the original debug-level to
the log.

Change-Id: I4b1118fef7e4752dbaaf796db2f9444927c7e178
CRs-Fixed: 2341953

wmi/src/wmi_unified.c

@@ -2099,8 +2099,7 @@ static void wmi_control_rx(void *ctx, HTC_PACKET *htc_packet)
 	id = WMI_GET_FIELD(qdf_nbuf_data(evt_buf), WMI_CMD_HDR, COMMANDID);
 	idx = wmi_unified_get_event_handler_ix(wmi_handle, id);
 	if (qdf_unlikely(idx == A_ERROR)) {
-		WMI_LOGE("%s :event handler is not registered: event id 0x%x\n",
-				 __func__, id);
+		wmi_debug("no handler registered for event id 0x%x", id);
 		qdf_nbuf_free(evt_buf);
 		return;
 	}