qcacld-3.0: Don't unregister vdev sync after pre CAC success

Currently , pre CAC adapter will be closed during SAP interface down.
But pre_cac vdev sync is being unregistered after pre CAC success.
Because of this, pre CAC adapter close will fail and the same pre CAC
adapter context will be retained for subsequent SAP start. As a result
pre CAC request may fail after SAP restart.

To address this, don't unregister vdev sync after pre CAC success.

Change-Id: I2d5969274de290bd86cd510ed2a3ff4e095042b0
CRs-Fixed: 2861298

core/hdd/src/wlan_hdd_hostapd.c

@@ -1157,13 +1157,9 @@ static void wlan_hdd_sap_pre_cac_success(void *data)
 	if (errno)
 		return;
 
-	osif_vdev_sync_unregister(adapter->dev);
-	osif_vdev_sync_wait_for_ops(vdev_sync);
-
 	__wlan_hdd_sap_pre_cac_success(adapter);
 
 	osif_vdev_sync_trans_stop(vdev_sync);
-	osif_vdev_sync_destroy(vdev_sync);
 }
 
 #ifdef FEATURE_WLAN_AP_AP_ACS_OPTIMIZE