provide more common DMA API functions V2

[Christoph Hellwig]

Since 2009 we have a nice asm-generic header implementing lots of DMA API
functions for architectures using struct dma_map_ops, but unfortunately
it's still missing a lot of APIs that all architectures still have to
duplicate.

This series consolidates the remaining functions, although we still
need arch opt outs for two of them as a few architectures have very
non-standard implementations.

Changes since V1:
 - keep a modified comment about dma_alloc_noncoherent vs
   dma_cache_sync in the ARM asm/dma-mapping.h
 - keep the ARM dma_set_mask instances to deal with dmabounce

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