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

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Change subject: mb/google/poppy: enable 8254 Static Clock Gating for XTAL shutdown
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/17838/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/62857/ : SUCCESS