- usbvision_muxsel simplified, now uses some well known constants.
- since the decoder needs to change input norm, call to muxsel added when
  changing video standard.
Signed-off-by: NThierry MERLE <thierry.merle@free.fr>
Acked-by: NDwaine Garden <DwaineGarden@rogers.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>