Small fixes for the IOMMU code:

1.) Handle maximum segment sizes which are smaller than the IOMMU page
    size by splitting up pages across multiple segments if needed; this case
    was previously unimplemented, and would cause panics.
2.) KASSERT that the physical address is in range; remove a KASSERT that
    has become pointless.
3.) Add a comment describing what remains to be fixed in the IOMMU code;
    I plan to address these issues soon.

Desired by:	dwhite (1)

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