[coreboot-gerrit] Change in coreboot[master]: util/release: Update genrelnotes script for 4.7 release

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Change subject: util/release: Update genrelnotes script for 4.7 release
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/17965/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/63004/ : SUCCESS