ARM: S3C64XX: Update consistent DMA size to 8MiB

Change the area available for consitent DMA allocations from the
default to 8MiB to allow drivers such as the framebuffer to get
more memory (for situations where larger virtual screen resolutions
are needed).
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c64xx/include/mach/memory.h

@@ -15,4 +15,6 @@
 
 #define PHYS_OFFSET     UL(0x50000000)
 
+#define CONSISTENT_DMA_SIZE	SZ_8M
+
 #endif