media: ipu3-cio2: Set CSI-2 receiver sub-device entity function

Set the entity function for the four CSI-2 receiver sub-devices the driver
creates. This avoids a kernel warning from each as well.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/pci/intel/ipu3/ipu3-cio2.c

@@ -1601,6 +1601,7 @@ static int cio2_queue_init(struct cio2_device *cio2, struct cio2_queue *q)
 	subdev->owner = THIS_MODULE;
 	snprintf(subdev->name, sizeof(subdev->name),
 		 CIO2_ENTITY_NAME " %td", q - cio2->queue);
+	subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
 	v4l2_set_subdevdata(subdev, cio2);
 	r = v4l2_device_register_subdev(&cio2->v4l2_dev, subdev);
 	if (r) {