Bluetooth: mgmt: Fix limited discoverable off timeout

LIMITED_DISCOVERABLE flag is not reset from Class of Device and
advertisement on limited discoverable timeout. This prevents to pass PTS
test GAP/DISC/LIMM/BV-02-C

Calling set_discoverable_sync as when the limited discovery is set
correctly update the Class of Device and advertisement.
Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

net/bluetooth/mgmt.c

@@ -1045,6 +1045,8 @@ static void rpa_expired(struct work_struct *work)
 	hci_cmd_sync_queue(hdev, rpa_expired_sync, NULL, NULL);
 }
 
+static int set_discoverable_sync(struct hci_dev *hdev, void *data);
+
 static void discov_off(struct work_struct *work)
 {
 	struct hci_dev *hdev = container_of(work, struct hci_dev,
@@ -1063,7 +1065,7 @@ static void discov_off(struct work_struct *work)
 	hci_dev_clear_flag(hdev, HCI_DISCOVERABLE);
 	hdev->discov_timeout = 0;
 
-	hci_update_discoverable(hdev);
+	hci_cmd_sync_queue(hdev, set_discoverable_sync, NULL, NULL);
 
 	mgmt_new_settings(hdev);