Change in coreboot[master]: mainboard/google/coral: Add devicetree.cb file for coral

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Change subject: mainboard/google/coral: Add devicetree.cb file for coral
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/58991/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/14338/ : SUCCESS