Change in coreboot[master]: mainboard/google/kahlee: Add careena variant

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Change subject: mainboard/google/kahlee: Add careena variant
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Patch Set 3: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/73673/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/27796/ : SUCCESS