Change in coreboot[master]: soc/amd/stoneyridge: Add GPIO functions to romstage

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Change subject: soc/amd/stoneyridge: Add GPIO functions to romstage
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Patch Set 17:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/57945/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13389/ : SUCCESS