[coreboot-gerrit] Change in coreboot[master]: soc/{apl,glk}: Allow to select the primary graphics device

[Nico Huber (Code Review)]

Attention is currently required from: Maxim Polyakov, Mario Scheithauer, Werner Zeh.
Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/39374 )

Change subject: soc/{apl,glk}: Allow to select the primary graphics device
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Patch Set 32: Code-Review+2