V4L/DVB (8582): set mts_firmware for em2882 based Pinnacle Hybrid Pro

Pinnacle Hybrid Pro (2304:0226) requires mts_firmware flag to have any
sound. Without this flag it is useful only for watching silent movies.

Signed-off-by: Eugeniy Meshcheryakov <eugen@debian.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>