V4L/DVB (4943): Cx88: cleanup dvb_pll_attach for lgdt3302 tuners

Since we're using dvb_pll_attach now, we dont have to populate
dev->core->pll_addr or dev->core->pll_desc anymore.

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