ARM: imx: move iomux drivers and headers into mach-imx

The board files in mach-imx are the only users of iomux drivers and
headers.  Move them into mach-imx from plat-mxc.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-imx/mach-mx27_3ds.c

@@ -38,11 +38,11 @@
 #include <asm/mach/time.h>
 #include <mach/hardware.h>
 #include <mach/common.h>
-#include <mach/iomux-mx27.h>
 #include <mach/ulpi.h>
 
 #include "3ds_debugboard.h"
 #include "devices-imx27.h"
+#include "iomux-mx27.h"
 
 #define SD1_EN_GPIO		IMX_GPIO_NR(2, 25)
 #define OTG_PHY_RESET_GPIO	IMX_GPIO_NR(2, 23)