Change in coreboot[master]: soc/amd/common: Add initial support for AMD PSP

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Change subject: soc/amd/common: Add initial support for AMD PSP
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Patch Set 3: Verified-1

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/54569/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/10284/ : SUCCESS