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ahc(4): Default to memory mapped IO
When this driver was written it made sense to make this default to off, but these days almost all BIOSses will do the right thing. Furthermore non-mmio communication only works on Intel architectures.
So lets default to allowing mmio, but not change the semantics of the AHC_ALLOW_MEMIO
flag to not break existing installs. Also document the already existing hint.ahc.<unit>.allow_memio
.