[media] tlg2300: switch to unlocked_ioctl

The driver already does locking, so it is safe to switch to unlocked_ioctl.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>