V4L/DVB (12901): DiB0700: add support for STK807XP and STK807XPVR

This patchs adds support for the DiB8000 based devices STK807xP and
STK807xPVR to the dib0700-device-tree.

[mchehab@redhat.com: Fix merge conflicts]

Signed-off-by: Olivier Grenie <Olivier.Grenie@dibcom.fr>
Signed-off-by: Patrick Boettcher <pboettcher@dibcom.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>