V4L/DVB (4293): Fix unstable DISEQC behaviour on budget cards.

Use the stv0299 native DISEQC implementation instead of the bitbanging one
as required by the ves1893. This was originally found by Oliver Endriss.

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