Patch merged into coreboot/master: drivers/intel/gma/vbt: Add Kconfig symbol for SSC ref

the following patch was just integrated into master:
commit 561bebfbaa55d5ab0656fbfc4866de88722d9618
Author: Nico Huber 
Date:   Thu Jan 19 16:28:18 2017 +0100

drivers/intel/gma/vbt: Add Kconfig symbol for SSC ref

The selection of the SSC reference frequency for LVDS was based on a
    completely unrelated clock.

The `ssc_freq` flag should be set when the SSC reference runs at a
    different frequency than the general display reference clock (DREF).
    For most platforms, there is no choice, i.e. for i945 and gm45 the SSC
    reference always differs from the display reference clock (i945: 66Mhz
    SSC vs. 48MHz DREF; gm45: 100MHz SSC vs. 96Mhz DREF), for Nehalem and
    newer, it's the same frequency for SSC/non-SSC (120MHz).  The only,
    currently supported platform with a choice seems to be Pineview, where
    the alternative is 100MHz vs. the default 96MHz.

Change-Id: I7791754bd366c9fe6832c32eccef4657ba5f309b
    Signed-off-by: Nico Huber 
    Reviewed-on: https://review.coreboot.org/18186
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/18186 for details.

-gerrit