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/iomux-imx31.c b/arch/arm/mach-imx/iomux-imx31.c
index 82bd440..7c3ba2b 100644
--- a/arch/arm/mach-imx/iomux-imx31.c
+++ b/arch/arm/mach-imx/iomux-imx31.c
@@ -23,7 +23,8 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <mach/hardware.h>
-#include <mach/iomux-mx3.h>
+
+#include "iomux-mx3.h"
 
 /*
  * IOMUX register (base) addresses