[media] m88ts2022: change parameter type of m88ts2022_cmd

It is driver internal function and does not need anything from
frontend structure. Due to that change parameter type to driver
state which is better for driver internal functions.

Also remove one unused variable from state itself.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>