[coreboot-gerrit] Change in coreboot[master]: spi: Add helper functions for bit-banging

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Change subject: spi: Add helper functions for bit-banging
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/69147/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/23501/ : SUCCESS