V4L/DVB (8994): Adjust MPEG initialization in cx24116

Adjust MPEG initialization in cx24116 in order to accomodate different
MPEG CLK position and polarity in different cards.

Signed-off-by: Igor M. Liplianin <liplianin@me.by>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>