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

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/20030 )

Change subject: util: change coreboot to lowercase
......................................................................

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