sh: define dma noncoherent API functions.

sh was missing these, too.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

include/asm-sh/dma-mapping.h

@@ -53,6 +53,10 @@ static inline void dma_free_coherent(struct device *dev, size_t size,
 	consistent_free(vaddr, size);
 }
 
+#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
+#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
+#define dma_is_consistent(d, h) (1)
+
 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 				  enum dma_data_direction dir)
 {