[media] rcar-vin: reset bytesperline and sizeimage when resetting format

These two were forgotten when refactoring the format reset code. If
they are not also reset at the same time as width and height the format
returned from G_FMT will not match reality.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>