arm: Move the definition of ARCH_HAS_DMA_MMAP_COHERENT where it belongs

[benh@kernel.crashing.org (Benjamin Herrenschmidt)]

Something I noticed while implementing dma_mmap_coherent() for powerpc...

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/arm/include/asm/dma-mapping.h |    2 +-
 sound/core/pcm_native.c            |    7 -------
 2 files changed, 1 insertions(+), 8 deletions(-)

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 4fff837..ed33eab 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -214,7 +214,7 @@ extern void dma_free_coherent(struct device *, size_t, void *, dma_addr_t);
  */
 int dma_mmap_coherent(struct device *, struct vm_area_struct *,
 		void *, dma_addr_t, size_t);
-
+#define ARCH_HAS_DMA_MMAP_COHERENT
 
 /**
  * dma_alloc_writecombine - allocate writecombining memory for DMA
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index ae42b65..2d99c37 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3145,13 +3145,6 @@ static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
 	.fault =	snd_pcm_mmap_data_fault,
 };
 
-#ifndef ARCH_HAS_DMA_MMAP_COHERENT
-/* This should be defined / handled globally! */
-#ifdef CONFIG_ARM
-#define ARCH_HAS_DMA_MMAP_COHERENT
-#endif
-#endif
-
 /*
  * mmap the DMA buffer on RAM
  */