ARM: Fix Versatile&Integrator includes to behave in the same way as Realview

Realview doesn't include mach/platform.h in mach/hardware.h, so
make versatile behave in the same way.  Also, move the definition
of __io_address() into mach/hardware.h, just like Realview.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-integrator/cpu.c b/arch/arm/mach-integrator/cpu.c
index 44d4c2e..b761879 100644
--- a/arch/arm/mach-integrator/cpu.c
+++ b/arch/arm/mach-integrator/cpu.c
@@ -20,6 +20,7 @@
 #include <linux/io.h>
 
 #include <mach/hardware.h>
+#include <mach/platform.h>
 #include <asm/mach-types.h>
 #include <asm/hardware/icst525.h>