V4L/DVB (5316): Add radio support for the Lifeview FlyDVB-T Duo

There are card variants supporting FM radio through tda8275.

Signed-off-by: Peter Missel <peter.missel@onlinehome.de>
Signed-off-by: Hartmut Hackmann <hartmut.hackmann@t-online.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>