V4L/DVB (4500): Fix KNC1 DVBC support

This actually needs the same configuration as the other DVBC cards; simply
no one had managed to test before to find out.

Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>