Change in coreboot[master]: google/kahlee: Set eMMC slot

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Change subject: google/kahlee: Set eMMC slot
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/58312/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13723/ : SUCCESS