implement generic dma_map_ops for IOMMUs v6

[Christoph Hellwig]

Hi Robin and Joerg,

I think we are finally ready for the generic dma-iommu series.  I have
various DMA API changes pending, and Tom has patches ready to convert
the AMD and Intel iommu drivers over to it.  I'd love to have this
in a stable branch shared between the dma-mapping and iommu trees
the day after rc2 is released.  I volunteer to create the branch,
but I'm fine with it living in the iommu tree as well.


A git tree is also available at:

    git://git.infradead.org/users/hch/misc.git dma-iommu-ops.6

Gitweb:

    http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-iommu-ops.6

Changes since v5:
 - rebased to latest linus tree and dropped a patch now merged
 - remove the now pointless __dma_iommu_mmap function
 - restore a cleanup from Robin that would have caused a conflict in
   last merge winow, but is fine now

Changes since v4:
 - rebased to 5.2-rc1

Changes since v3:
 - fold the separate patch to refactor mmap bounds checking
 - don't warn on not finding a vm_area
 - improve a commit log
 - refactor __dma_iommu_free a little differently
 - remove a minor MSI map cleanup to avoid a conflict with the
   "Split iommu_dma_map_msi_msg" series

Changes since v2:
 - address various review comments and include patches from Robin

Changes since v1:
 - only include other headers in dma-iommu.h if CONFIG_DMA_IOMMU is enabled
 - keep using a scatterlist in iommu_dma_alloc
 - split out mmap/sgtable fixes and move them early in the series
 - updated a few commit logs
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