V4L/DVB (3276): Added terratec hybrid xs and kworld 2800rf support

- Added terratec hybrid xs product/vendorid
- Added gpio audio initialization for kworld pvr 2800rf

Signed-off-by: Markus Rechberger <mrechberger@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>