The selection/cropping ioctls are only valid for video nodes, not for vbi.

Found by v4l2-compliance when run on a VBI device node.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>