Change in coreboot[master]: amd/stoneyridge: Add pm_read32 and pm_write32 to southbridge

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Change subject: amd/stoneyridge: Add pm_read32 and pm_write32 to southbridge
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Patch Set 3:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/61451/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/16582/ : SUCCESS