V4L/DVB (3362): KWorld ATSC110: implement set_pll_input

- When tuning VSB, use ANT input
- When tuning QAM, use CABLE input

Signed-off-by: Curt Meyers <cmeyers@boilerbots.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>