Change in coreboot[master]: nb/intel/x4x: Adapt post JEDEC for DDR3

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Change subject: nb/intel/x4x: Adapt post JEDEC for DDR3
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Patch Set 19:

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/25179/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/71002/ : SUCCESS