riscv: Add asm/dma-mapping.h for DMA mappings
This patch adds asm/dma-mapping.h for Linux-like DMA mappings APIs required by some of the drivers (such as, Cadance MACB Ethernet driver). Signed-off-by: NAnup Patel <anup.patel@wdc.com> Reviewed-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NAlexander Graf <agraf@suse.de> Reviewed-by: NLukas Auer <lukas.auer@aisec.fraunhofer.de>
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