Change in coreboot[master]: security/vboot: Add boot mode selection

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/23756 )

Change subject: security/vboot: Add boot mode selection
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Patch Set 15: Verified-1

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/67502/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/22035/ : SUCCESS