Change in coreboot[master]: nb/intel/sandybridge/earlyinit: Add Kconfig for PCIe Gen3

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Change subject: nb/intel/sandybridge/earlyinit: Add Kconfig for PCIe Gen3
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Patch Set 3: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/58380/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13802/ : SUCCESS