Change in coreboot[master]: soc/cavium: Move SPI to common folder

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Change subject: soc/cavium: Move SPI to common folder
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Patch Set 1: Verified-1

Build Failed

https://qa.coreboot.org/job/coreboot-gerrit/67551/ : FAILURE

https://qa.coreboot.org/job/coreboot-checkpatch/22069/ : SUCCESS