qcacld-3.0: Use mac_handle_t in wlan_hdd_subnet_detect

Change "qcacld-3.0: Introduce mac_handle_t" introduced a modern
name for what was previously called the tHalHandle. Transition
wlan_hdd_subnet_detect to use the new naming.

Change-Id: Idc648bd965dc29ed620bf8f85b04c7658e51253d
CRs-Fixed: 2262582

core/hdd/src/wlan_hdd_subnet_detect.c

@@ -156,7 +156,7 @@ static int __wlan_hdd_cfg80211_set_gateway_params(struct wiphy *wiphy,
 
 	hdd_nud_set_gateway_addr(adapter, req.gw_mac_addr);
 
-	status = sme_gateway_param_update(hdd_ctx->hHal, &req);
+	status = sme_gateway_param_update(hdd_ctx->mac_handle, &req);
 	if (!QDF_IS_STATUS_SUCCESS(status)) {
 		hdd_err("sme_gateway_param_update failed(err=%d)", status);
 		ret = -EINVAL;