[coreboot-gerrit] Change in coreboot[master]: binarypi mainboards: Clean up IS_ENABLED fan control

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Change subject: binarypi mainboards: Clean up IS_ENABLED fan control
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Patch Set 1: Verified-1

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/58703/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/14083/ : SUCCESS