media: atomisp: Make MC link from ISP to /dev/video# output node immutable

The link from the ISP's source pad to the /dev/video# output v4l2-dev
is always enabled and immutable, mark it as such.
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_v4l2.c

@@ -1090,7 +1090,8 @@ int atomisp_register_device_nodes(struct atomisp_device *isp)
 		return err;
 
 	err = media_create_pad_link(&isp->asd.subdev.entity, ATOMISP_SUBDEV_PAD_SOURCE,
-				    &isp->asd.video_out.vdev.entity, 0, 0);
+				    &isp->asd.video_out.vdev.entity, 0,
+				    MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
 	if (err)
 		return err;