Change in coreboot[master]: mb/google/sarien/var/sarien: Add VBT from Chromebook firmware

[Matt DeVillier (Code Review)]

Attention is currently required from: Felix Singer, Paul Menzel, Tim Wawrzynczak, Angel Pons.
Matt DeVillier has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/60735 )

Change subject: mb/google/sarien/var/sarien: Add VBT from Chromebook firmware
......................................................................

Patch Set 1:

(2 comments)

Patchset:

PS1:
> Where are the VBTs in the Chromium repositories?

not in a public repo unfortunately

PS1: 
might as well add for ARCADA too, and then select INTEL_GMA_HAVE_VBT in Kconfig