[coreboot-gerrit] Change in coreboot[master]: mainboard/google/zoombini: add mainboard_ops

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Change subject: mainboard/google/zoombini: add mainboard_ops
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Patch Set 2:

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/19977/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/65244/ : SUCCESS