riscv: select DMA_DIRECT_OPS instead of redefining it
DMA_DIRECT_OPS is defined in lib/Kconfig, so don't duplicate it in arch/riscv/Kconfig. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NPalmer Dabbelt <palmer@sifive.com>
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