Change in coreboot[master]: soc/intel/common/pch: Add pch lockdown code

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Change subject: soc/intel/common/pch: Add pch lockdown code
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Patch Set 59:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/73765/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/27882/ : SUCCESS