arm/imx: let platform files include the SoC-specific iomux header

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/mach-mx2/mach-mx21ads.c b/arch/arm/mach-mx2/mach-mx21ads.c
index 393bc07..113e58d 100644
--- a/arch/arm/mach-mx2/mach-mx21ads.c
+++ b/arch/arm/mach-mx2/mach-mx21ads.c
@@ -30,7 +30,7 @@
 #include <asm/mach/map.h>
 #include <mach/imx-uart.h>
 #include <mach/imxfb.h>
-#include <mach/iomux.h>
+#include <mach/iomux-mx21.h>
 #include <mach/mxc_nand.h>
 #include <mach/mmc.h>
 #include <mach/board-mx21ads.h>