scatterlist cleanups

[Christoph Hellwig]

This series contains various scatterlist cleanups.  It makes the chained
scatterlist helpers generally available, even if a architecture doesn't
allow a DMA mapping for it, and changes two callers to make use of this
as well as cleans up various opencoded access to scatterlist internals.

A large part of this work is based on older patches from Dan.

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