add mate's patch for 9020 sff/mt fan controls
    
    see:
    
    https://review.coreboot.org/c/coreboot/+/81529
    
    what i've merged is patchset 4. i had to rebase it slightly,
    because the libreboot version has the iommu toggle on cmos
    configs, which are files that mate's patch also changes,
    leading to merge conflict.
    
    Signed-off-by: Leah Rowe <leah@libreboot.org>