[coreboot-gerrit] Change in coreboot[master]: util/sconfig: Change walk_device_tree to breadth-first walk

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Change subject: util/sconfig: Change walk_device_tree to breadth-first walk
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Patch Set 2:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/74105/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/28219/ : SUCCESS