Change in coreboot[master]: soc/amd/stoneyridge: Add southbridge definitions

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Change subject: soc/amd/stoneyridge: Add southbridge definitions
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Patch Set 9: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/22754/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/68319/ : SUCCESS