V4L/DVB: ngene: Add lgdt3303 and mt2131 deps to Kconfig

Add the demod and tuner dependencies required for the Avermedia m780 to the
Kconfig for the ngene driver.

Thanks to Oliver Endriss for pointing this out.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>