[media] go7007: simplify the PX-TV402U board ID handling

There really is no need to split out the board IDs for each tuner.
That's what the tuner_type is for, after all.

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