qcacld-3.0: Handle station stats request while ll stats in progress

Currently host can get station stats request while ll stats is in
progress and station stats request gets timeout for below sequence,
	1) Host receives LL stats request and sends unified stats
	   command to fw.
	2) FW has sent all the station stats events and in process
	   of sending ll stats, host gets station stats command
	   and sends the station stats command to fw.
	3) After receiving all ll stats host resets pending stations
	   stats.
	4) As request is already reset, host doesn't find any pending
	   request while processing the last stats event hence request
	   gets timeout.

To address this issue send cached stations stats if unified ll stats
is in progress.

Change-Id: I153ca4657c0736b4a174b247c82eb38527b9dae9
CRs-Fixed: 3753712

core/hdd/src/wlan_hdd_stats.c

@@ -3325,16 +3325,19 @@ static QDF_STATUS wlan_hdd_stats_request_needed(struct hdd_adapter *adapter)
 		hdd_err("Invalid hdd config");
 		return QDF_STATUS_E_INVAL;
 	}
+
 	if (adapter->hdd_ctx->is_get_station_clubbed_in_ll_stats_req) {
 		uint32_t stats_cached_duration;
 
 		stats_cached_duration =
 				qdf_system_ticks_to_msecs(qdf_system_ticks()) -
 				adapter->sta_stats_cached_timestamp;
-		if (stats_cached_duration <=
-			adapter->hdd_ctx->config->sta_stats_cache_expiry_time)
+		if (qdf_atomic_read(&adapter->is_ll_stats_req_pending) ||
+		    (stats_cached_duration <=
+			adapter->hdd_ctx->config->sta_stats_cache_expiry_time))
 			return QDF_STATUS_E_ALREADY;
 	}
+
 	return QDF_STATUS_SUCCESS;
 }