V4L/DVB (4032): Fix Pinnacle 300i

I had broken the mt352 tuning when a non-directly connected PLL was used -
uncommon, but this is what is used on the pinnacle card.

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