Change in coreboot[master]: google/kahee: Fix number of memory channels

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Change subject: google/kahee: Fix number of memory channels
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/60700/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/15902/ : SUCCESS