media: v4l2-dev: fix is_tch checks

Touch devices mark too many ioctls as valid. Restrict the list of
valid ioctls for touch devices.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>