media: media-request: Add compat ioctl

Currently media request ioctl operations fail on 64-bit kernel with
32-bit userspace due to missing .compat_ioctl callback.

Because no ioctl command uses any argument, just reuse existing ioctl
handler for compat_ioctl too.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>