Change in coreboot[master]: amd/stoneyridge: Move pm/smi_read/write functions to util file

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Change subject: amd/stoneyridge: Move pm/smi_read/write functions to util file
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Patch Set 2:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/61452/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/16584/ : SUCCESS