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>
diff --git a/arch/arm/mach-imx/mach-mx31lite.c b/arch/arm/mach-imx/mach-mx31lite.c
index f693558..7d80aa2 100644
--- a/arch/arm/mach-imx/mach-mx31lite.c
+++ b/arch/arm/mach-imx/mach-mx31lite.c
@@ -41,11 +41,11 @@
 
 #include <mach/hardware.h>
 #include <mach/common.h>
-#include <mach/iomux-mx3.h>
 #include <mach/ulpi.h>
 
 #include "board-mx31lite.h"
 #include "devices-imx31.h"
+#include "iomux-mx3.h"
 
 /*
  * This file contains the module-specific initialization routines.