The IORT table usually only contains single mappings. While on the LX2K there

The IORT table usually only contains single mappings.  While on the LX2K there
is a non-single mapping for the networking subsystem, we don't yet have support
for it and apparently Linux has trouble with it as well.  So for now we can
remove the code, because it uses an uninitialized variable and there's no easy
way to fix it without re-thinking the concept.  The code got there in the first
place because it's a copy of the same pattern in our other IOMMU code.

ok jsg@