V4L/DVB (12956): Fix gpio mutex in NetUP Dual DVB-S2 CI card.

The card uses the same cx23885 gpio lines for two adapters.
In case of there is several cards in system we must implement
gpio mutex per cx23885 chip.

Signed-off-by: Abylay Ospan <aospan@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>