dma-mapping-5.13

dma-mapping updates for Linux 5.13:

 - add a new dma_alloc_noncontiguous API (me, Ricardo Ribalda)
 - fix a copyright noice (Hao Fang)
 - add an unlikely annotation to dma_mapping_error (Heiner Kallweit)
 - remove a pointless empty line (Wang Qing)
 - add support for multi-pages map/unmap bencharking (Xiang Chen)
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