nommu: Add MMU-less support for RealView/EB

This patch redefines the IO_ADDRESS macro.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

include/asm-arm/arch-realview/hardware.h

@@ -39,7 +39,11 @@
 #define pcibios_assign_all_busses()     1
 
 /* macro to get at IO space when running virtually */
+#ifdef CONFIG_MMU
 #define IO_ADDRESS(x)		((((x) & 0x0effffff) | (((x) >> 4) & 0x0f000000)) + 0xf0000000)
+#else
+#define IO_ADDRESS(x)		(x)
+#endif
 #define __io_address(n)		((void __iomem *)IO_ADDRESS(n))
 
 #endif