Change in coreboot[master]: devicetree: Add method to delete property by name

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Change subject: devicetree: Add method to delete property by name
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Patch Set 3: Verified-1

Build Failed

https://qa.coreboot.org/job/coreboot-gerrit/73667/ : FAILURE

https://qa.coreboot.org/job/coreboot-checkpatch/27790/ : SUCCESS