[ARM] Move common definition of MAX_DMA_ADDRESS to asm/dma.h

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

include/asm-arm/dma.h

@@ -9,6 +9,13 @@ typedef unsigned int dmach_t;
 #include <asm/scatterlist.h>
 #include <asm/arch/dma.h>
 
+/*
+ * This is the maximum virtual address which can be DMA'd from.
+ */
+#ifndef MAX_DMA_ADDRESS
+#define MAX_DMA_ADDRESS	0xffffffff
+#endif
+
 /*
  * DMA modes
  */