[coreboot-gerrit] Change in coreboot[master]: lib/device_tree: Add method to get phandle

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Change subject: lib/device_tree: Add method to get phandle
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/74754/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/28854/ : SUCCESS