qcacld-3.0: Update statsClearReqmask for LL_STATS

Whenvever WiFi is disconnected, link layer stats are cleared
by wlan_hdd_clear_link_layer_stats(). In the current driver
implementation the statsClearReqMask is set clear IFACE_AC and
IFACE_ALL_PEER only. This results in driver reporting incorrect
contention stats, even though WiFi is disconnected.

To resolve this issue, update statsClearReqMask to clear
IFACE_CONTENTION stats as well.

Change-Id: I1e07df91823db1db70f73075982e551f4b8a85c7
CRs-Fixed: 3323943

core/hdd/src/wlan_hdd_stats.c

@@ -2679,7 +2679,7 @@ void wlan_hdd_clear_link_layer_stats(struct hdd_adapter *adapter)
 	mac_handle_t mac_handle = adapter->hdd_ctx->mac_handle;
 
 	link_layer_stats_clear_req.statsClearReqMask = WIFI_STATS_IFACE_AC |
-		WIFI_STATS_IFACE_ALL_PEER;
+		WIFI_STATS_IFACE_ALL_PEER | WIFI_STATS_IFACE_CONTENTION;
 	link_layer_stats_clear_req.stopReq = 0;
 	link_layer_stats_clear_req.reqId = 1;
 	link_layer_stats_clear_req.staId = adapter->vdev_id;