clean up dma_declare_coherent_memory calling conventions

From: Christoph Hellwig
Date: Tue Jun 27 2017 - 16:17:49 EST

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Remove various unused flags, and return a reasonable error code.

Next message: Christoph Hellwig: "[PATCH 2/2] dma-coherent: remove the DMA_MEMORY_MAP and DMA_MEMORY_IO flags"
Previous message: Daniel Micay: "Re: [PATCH v2] kref: Avoid null pointer dereference after WARN"
Next in thread: Christoph Hellwig: "[PATCH 2/2] dma-coherent: remove the DMA_MEMORY_MAP and DMA_MEMORY_IO flags"
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