[ARM] move MAX_DMA_ADDRESS to mach/memory.h

Move the definition of MAX_DMA_ADDRESS from mach/dma.h to mach/memory.h,
thereby placing it along side its relative, ISA_DMA_THRESHOLD.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/include/asm/dma.h b/arch/arm/include/asm/dma.h
index 75154b1..6a4d44a 100644
--- a/arch/arm/include/asm/dma.h
+++ b/arch/arm/include/asm/dma.h
@@ -4,6 +4,7 @@
 typedef unsigned int dmach_t;
 
 #include <linux/spinlock.h>
+#include <asm/memory.h>
 #include <asm/system.h>
 #include <asm/scatterlist.h>
 #include <mach/dma.h>