dma-mapping-5.15

dma-mapping updates for Linux 5.15

 - fix debugfs initialization order (Anthony Iliopoulos)
 - use memory_intersects() directly (Kefeng Wang)
 - allow to return specific errors from ->map_sg
   (Logan Gunthorpe, Martin Oliveira)
 - turn the dma_map_sg return value into an unsigned int (me)
 - provide a common global coherent pool іmplementation (me)
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