[coreboot-gerrit] Change in coreboot[master]: mainboard/google: Disable big, pit, and ryu ec builds

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Change subject: mainboard/google: Disable big, pit, and ryu ec builds
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/67736/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/22239/ : SUCCESS