Change in coreboot[master]: mainboard/google/zoombini: Provide memory configuration variant API

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Change subject: mainboard/google/zoombini: Provide memory configuration variant API
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Patch Set 7: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/17761/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/62760/ : SUCCESS