arm64: fix build error if DMA_CMA is enabled

arm64/include/asm/dma-contiguous.h is trying to include
<asm-genric/dma-contiguous.h> which does not exist, and thus failing
build for arm64 if we enable CONFIG_DMA_CMA. This patch fixes build
error by removing unwanted header inclusion from arm64's dma-contiguous.h.

Signed-off-by: Pankaj Dubey <[e-mail]>
Signed-off-by: Somraj Mani <[e-mail]>
Acked-by: Laura Abbott <[e-mail]>
Signed-off-by: Catalin Marinas <[e-mail]>

arch/arm64/include/asm/dma-contiguous.h

···
 #ifdef CONFIG_DMA_CMA
 
 #include <linux/types.h>
-#include <asm-generic/dma-contiguous.h>
 
 static inline void
 dma_contiguous_early_fixup(phys_addr_t base, unsigned long size) { }