V4L/DVB (7568): Support for DVB-S demod PN1010 (clone of S5H1420) added

This device is a clone of the PN1010 used by SkyStar2 rev2.7 .

This patch adds support for the flexcop-device and makes the driver look a little bit nicer.

It needs to be checked whether the driver is still ok for the budget-cards.

Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>