Change in coreboot[master]: mainboard/google/reef: Override VBT selection in coral

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Change subject: mainboard/google/reef: Override VBT selection in coral
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Patch Set 3: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/61272/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/16419/ : SUCCESS