dma-mapping-5.20-2022-08-06

dma-mapping updates

 - convert arm32 to the common dma-direct code (Arnd Bergmann, Robin Murphy,
   Christoph Hellwig)
 - restructure the PCIe peer to peer mapping support (Logan Gunthorpe)
 - allow the IOMMU code to communicate an optional DMA mapping length
   and use that in scsi and libata (John Garry)
 - split the global swiotlb lock (Tianyu Lan)
 - various fixes and cleanup (Chao Gao, Dan Carpenter, Dongli Zhang,
   Lukas Bulwahn, Robin Murphy)
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