V4L/DVB (4478): [av7110] Support Grundig DVB-T tuner for sub-system 13c2:0001

Some DVB-T cards with Grundig 29504-401 tuner use subsystem id 13c2:0001
(reported by Stuart Butterfield).

Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>