Change in coreboot[master]: mb/google/poppy: enable 8254 Clock Gating on poppy for XTAL shutdown

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Change subject: mb/google/poppy: enable 8254 Clock Gating on poppy for XTAL shutdown
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Patch Set 4:

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/18018/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/63066/ : SUCCESS