When an IOMMU is not available, and an sbus board has register ranges not

reachable with the default slot aperture (such as hme(4) devices, which have
their registers at offset 0x08c00000 from the slot base), force the attachment
of the device to fail.

While hme would fail early due to being unable to talk on the mdio bus, hme+esp
boards would have the esp part of the board get nuts and would spin during
autoconf. Of course, you are not supposed to use such boards on sun4c, because
(as mentioned above) they can't run without an iommu.

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