Change in coreboot[master]: [WIP]drivers/spi: Winbond specific writeprotection enable

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Change subject: [WIP]drivers/spi: Winbond specific writeprotection enable
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Patch Set 3:

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/23133/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/68742/ : SUCCESS