Change in coreboot[master]: google/gru: Add Nefario

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Change subject: google/gru: Add Nefario
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/56872/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/12419/ : SUCCESS