V4L/DVB (8644): Add support for DViCO FusionHDTV DVB-T Dual Express

Add support for the DViCO FusionHDTV DVB-T Dual Express card, based on
work by Chris Pascoe and Stephen Backway.

Signed-off-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>