V4L/DVB (5776): Hardware MPEG audio fix for SAA7134 based "KNC One TV-Station DVR" card

With previous patch card is generating MPEG audio stream too.
Unfortunatly I2S audio output is muted. Unmute it.

Signed-off-by: Rafal Bilski <rafalbilski@interia.pl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>