[coreboot-gerrit] Change in coreboot[master]: util: change coreboot to lowercase

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Change subject: util: change coreboot to lowercase
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/10549/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/54849/ : SUCCESS