Change in coreboot[master]: libpayload: Fill reg_base for debugging purposes

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Change subject: libpayload: Fill reg_base for debugging purposes
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Patch Set 3:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/51012/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/6994/ : SUCCESS