qcacld-3.0: Fix IMPS disable issue

Fix IMPS disable issue caused by
Change-Id: I0e9f83df2cfc144738bf02e7d25e30c82b5da693

Change-Id: I5a42d2af1ab70a43c57f7af3a3f5fd80e43e2807
CRs-Fixed: 3628619

core/hdd/src/wlan_hdd_main.c

@@ -3654,14 +3654,16 @@ int hdd_start_adapter(struct hdd_adapter *adapter, bool rtnl_held)
 	hdd_enter_dev(adapter->dev);
 
 	switch (device_mode) {
+	case QDF_MONITOR_MODE:
+		ret = hdd_start_station_adapter(adapter);
+		if (ret)
+			goto err_start_adapter;
+		hdd_set_idle_ps_config(adapter->hdd_ctx, false);
+		break;
 	case QDF_STA_MODE:
 	case QDF_P2P_CLIENT_MODE:
 		if (hdd_max_sta_interface_up_count_reached(adapter))
 			goto err_start_adapter;
-
-		fallthrough;
-	case QDF_MONITOR_MODE:
-		hdd_set_idle_ps_config(adapter->hdd_ctx, false);
 		fallthrough;
 	case QDF_P2P_DEVICE_MODE:
 	case QDF_OCB_MODE: