Change in coreboot[master]: google/kahlee: Start Kahlee mainboard

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Change subject: google/kahlee: Start Kahlee mainboard
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/10288/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/54574/ : SUCCESS