dma-mapping-6.6-2023-08-29

dma-maping updates for Linux 6.6

 - allow dynamic sizing of the swiotlb buffer, to cater for secure
   virtualization workloads that require all I/O to be bounce buffered
   (Petr Tesarik)
 - move a declaration to a header (Arnd Bergmann)
 - check for memory region overlap in dma-contiguous (Binglei Wang)
 - remove the somewhat dangerous runtime swiotlb-xen enablement and
   unexport is_swiotlb_active (Christoph Hellwig, Juergen Gross)
 - per-node CMA improvements (Yajun Deng)
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