[ARM] mxc: add missing include

include devices.h from devices.c to avoid inconsistencies and to fix
sparse warnings

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx3/devices.c b/arch/arm/mach-mx3/devices.c
index c48a341..7cfdef0 100644
--- a/arch/arm/mach-mx3/devices.c
+++ b/arch/arm/mach-mx3/devices.c
@@ -25,6 +25,8 @@
 #include <mach/irqs.h>
 #include <mach/imx-uart.h>
 
+#include "devices.h"
+
 static struct resource uart0[] = {
 	{
 		.start = UART1_BASE_ADDR,