V4L/DVB (8840): dib0700: add basic support for Hauppauge Nova-TD-500 (84xxx)

This adds basic support for the Hauppauge Nova-TD-500 84xxx series.

A future patch will allow for one aerial input to supply both tuners.

With the current code, an aerial must be plugged into each antannae input
in order for both tuners to function.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>