Change in coreboot[master]: cr50: check if the new image needs to be enabled and act on it

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Change subject: cr50: check if the new image needs to be enabled and act on it
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Patch Set 5: Verified-1

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/53220/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/9041/ : SUCCESS