[ARM] S3C64XX: Remove __virt_to_bus/__bus_to_virt macros

The changes for ARM highmem support have removed the need
for the __virt_to_bus and __bus_to_virt macros, so remove them
from this build.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c6400/include/mach/memory.h

@@ -15,7 +15,4 @@
 
 #define PHYS_OFFSET     UL(0x50000000)
 
-#define __virt_to_bus(x) __virt_to_phys(x)
-#define __bus_to_virt(x) __phys_to_virt(x)
-
 #endif