[coreboot-gerrit] Change in coreboot[master]: payloads/external/GRUB2: Only rebuild on config changes

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Change subject: payloads/external/GRUB2: Only rebuild on config changes
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/58514/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13914/ : SUCCESS