mx1: add missing include

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx1/generic.c

@@ -26,6 +26,7 @@
 
 #include <asm/mach/map.h>
 
+#include <mach/common.h>
 #include <mach/hardware.h>
 
 static struct map_desc imx_io_desc[] __initdata = {