Change in coreboot[master]: util/abuild: Save checksums of built rom files

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Change subject: util/abuild: Save checksums of built rom files
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/50944/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/6915/ : SUCCESS