[coreboot-gerrit] Change in coreboot[master]: intel/gma: Only enable bus mastering if we are going to use it

[Matt DeVillier (Code Review)]

Matt DeVillier has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/40727 )

Change subject: intel/gma: Only enable bus mastering if we are going to use it
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Patch Set 2:

need to check if this breaks using external GOP driver with Tianocore (in which NO_GFX_INIT is set)