nb/intel/sandybridge/gma: Always initialize DP buffer translation

These settings should be always made by the firmware, no matter if we
set up graphics or not. It looks like Linux doesn't even know these
registers.

The values are taken from the PRMs for Sandy Bridge and Ivy Bridge [1,
2]. They match the settings that were done in the native graphics path
for Ivy Bridge. I expect the differences to be an update (i.e. the set-
tings we did on the Sandy Bridge path were just outdated). Also, these
settings affect the PCH and not the CPU which are independent from each
other.

[1] Intel® OpenSource HD Graphics Programmer’s Reference Manual (PRM)
    Volume 3 Part 3: PCH Display Registers (SandyBridge)
    Doc Ref #: IHD-OS-V3 Pt3 – 05 11
    https://01.org/sites/default/files/documentation/snb_ihd_os_vol3_part3.pdf

[2] Intel ® OpenSource HD Graphics Programmer’s Reference Manual (PRM)
    Volume 3 Part 4: South Display Engine Registers (Ivy Bridge)
    Doc Ref #: IHD-OS-V3 Pt 4 – 05 12
    https://01.org/sites/default/files/documentation/ivb_ihd_os_vol3_part4.pdf

Change-Id: I83cc90c7558b93273a727f332fb0d8ced47ed70e
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/17073
Tested-by: build bot (Jenkins)
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

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