[MIPS] Don't claim we support dma_declare_coherent_memory - we don't.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

include/asm-mips/dma-mapping.h

@@ -68,6 +68,7 @@ extern int dma_is_consistent(struct device *dev, dma_addr_t dma_addr);
 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 	       enum dma_data_direction direction);
 
+#if 0
 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 
 extern int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
@@ -75,5 +76,6 @@ extern int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 extern void dma_release_declared_memory(struct device *dev);
 extern void * dma_mark_declared_memory_occupied(struct device *dev,
 	dma_addr_t device_addr, size_t size);
+#endif
 
 #endif /* _ASM_DMA_MAPPING_H */