V4L/DVB (3879): Convert saa7134-dvb to refactored tuner code

Rename pll calls to appropriate tuner calls.
Remove pll functions from demod structures.
Hook tuner call into tuner_ops.
Attach dvb-pll where possible.
Add pll gate control calls where appropriate.
Move europa specific code from tda1104x into card driver using ops overrides
(this is how it should ebe done instead of hacking card specific code into
the demod driver).

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