V4L/DVB (5033): MSI TV@nywhere Plus fixes

- MSI TV@nywhere Plus. Fix radio, S-Video and external analog audio in
  as far we can know currently.

Signed-off-by: Hermann Pitton <hermann-pitton@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>