I added dma_address and dma_length to struct scatterlist and
removed orig_address.  This brings IA64 in line with most other
architectures, but required a few changes to swiotlb.

Grant Grundler did the sba_iommu.c updates.

Note that this isn't *quite* enough to make the generic kernel
work on ZX1 boxes, because the ACPI in 2.5.18 barfs on a
ZX1 _CRS method.

David, I've tested both the swiotlb (on i2000 and ZX1) and
sba_iommu (on ZX1, with a kludge for the ACPI problem),
and they seem to work fine.