m68k: use simpler dma_alloc_coherent() for ColdFire CPUs

On all ColdFire platforms (whether MMU enabled or not) we want to use the
simple page based dma_alloc_coherent. We don't want the virtual mapping
version that is used on classic m68k setups. So modify the conditionals
to use the existing simpler dma_alloc_coherent on all ColdFire and non-MMU
builds.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

arch/m68k/kernel/dma.c

@@ -16,7 +16,7 @@
 
 #include <asm/pgalloc.h>
 
-#ifdef CONFIG_MMU
+#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
 
 void *dma_alloc_coherent(struct device *dev, size_t size,
 			 dma_addr_t *handle, gfp_t flag)
@@ -96,7 +96,7 @@ void dma_free_coherent(struct device *dev, size_t size,
 	free_pages((unsigned long)vaddr, get_order(size));
 }
 
-#endif /* CONFIG_MMU */
+#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
 
 EXPORT_SYMBOL(dma_alloc_coherent);
 EXPORT_SYMBOL(dma_free_coherent);