asm-generic: Make dma-contiguous.h a mandatory include/asm header
dma-continuguous.h is generic for all architectures except arm32 which has its own version. Similar change was done for msi.h by commit a1b39bae ("asm-generic: Make msi.h a mandatory include/asm header") Suggested-by: NChristoph Hellwig <hch@infradead.org> Link: https://lore.kernel.org/linux-arm-kernel/20200117080446.GA8980@lst.de/T/#m92bb56b04161057635d4142e1b3b9b6b0a70122eSigned-off-by: NMichal Simek <michal.simek@xilinx.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Acked-by: NThomas Gleixner <tglx@linutronix.de> Acked-by: NArnd Bergmann <arnd@arndb.de> Acked-by: Paul Walmsley <paul.walmsley@sifive.com> # for arch/riscv
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