[coreboot-gerrit] Change in coreboot[master]: soc/amd/common: Rename spi.c and add prototype

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Change subject: soc/amd/common: Rename spi.c and add prototype
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/64093/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/18926/ : SUCCESS