V4L/DVB (3099): Fixed device controls for em28xx on WinTV USB2 devices

- Controls now come from video and audio decoder driver for msp3400 and tvp5150.
- Added audio and sound controls as provided by msp3400 and tvp5150.

Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>