[coreboot-gerrit] Change in coreboot[master]: src/mainboard: Add and update license headers

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Change subject: src/mainboard: Add and update license headers
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Patch Set 3: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/74006/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/28118/ : SUCCESS