Change in coreboot[master]: amd/stoneyridge: Add northbridge register macros

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Change subject: amd/stoneyridge: Add northbridge register macros
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/17953/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/62991/ : SUCCESS