V4L/DVB (7415): use tuner-simple for Philips TUV1236D digital tuning support

Convert cx88-dvb and saa7134-dvb to use tuner-simple instead of dvb-pll
for Philips TUV1236D

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