add a sg_dma backend for amd64 bus_dma. This is a lot more clever about

mapping to the gart than the old code, and shouldn't conflict with
bouncebuffers when they're added.

This is essentially the sparc64 iommu code that's been modularised a bit
so I can eventually use the same code for agp-based dma for memory
managed drm drivers.

Now, this would overflow ramdiskA, so iommu and sg_dma are now #ifndef
SMALL_KERNEL.

ok kettenis@, marco@. SMALL_KERNEL discussions with deraadt.

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