media: rcar-csi2: Cleanup subdevice in remove()

Cleanup the V4L2 subdevice in the driver's remove function to
ensure its async connection are freed, and guarantee in future that
the subdev active state is cleaned up.

Fixes: 769afd21 ("media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver driver")
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-4-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/media/platform/renesas/rcar-csi2.c

@@ -1938,6 +1938,7 @@ static void rcsi2_remove(struct platform_device *pdev)
 	v4l2_async_nf_unregister(&priv->notifier);
 	v4l2_async_nf_cleanup(&priv->notifier);
 	v4l2_async_unregister_subdev(&priv->subdev);
+	v4l2_subdev_cleanup(&priv->subdev);
 
 	pm_runtime_disable(&pdev->dev);