nios2: use generic dma_noncoherent_ops
Switch to the generic noncoherent direct mapping implementation. Signed-off-by: NChristoph Hellwig <hch@lst.de> Acked-by: NLey Foon Tan <ley.foon.tan@intel.com> Tested-by: NLey Foon Tan <ley.foon.tan@intel.com>
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