Change in coreboot[master]: soc/intel/apollolake: Add PCIe de-emphasis enable configuration.

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Change subject: soc/intel/apollolake: Add PCIe de-emphasis enable configuration.
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Patch Set 7: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/23099/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/68705/ : SUCCESS