V4L/DVB (12402): em28xx: fix: some em2710 chips use a different vendor ID

Thanks to hermann pitton <hermann-pitton@arcor.de> for pointing this new
variation.

Tested-by: hermann pitton <hermann-pitton@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>