[ARM] s3c: define __io using the typesafe version

as per 0560cf5aSigned-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/plat-s3c/include/mach/io.h

@@ -10,7 +10,7 @@
 #define __ASM_ARM_ARCH_IO_H
 
 /* No current ISA/PCI bus support. */
-#define __io(a)		((void __iomem *)(a))
+#define __io(a)		__typesafe_io(a)
 #define __mem_pci(a)	(a)
 
 #define IO_SPACE_LIMIT (0xFFFFFFFF)