MX3: Add missing entry in devices.h

Add missing mxc_rnga_device entry in devices.h (mxc-master tree).

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx3/devices.h b/arch/arm/mach-mx3/devices.h
index 475410a..ffd494d 100644
--- a/arch/arm/mach-mx3/devices.h
+++ b/arch/arm/mach-mx3/devices.h
@@ -16,3 +16,5 @@
 extern struct platform_device mxcsdhc_device0;
 extern struct platform_device mxcsdhc_device1;
 extern struct platform_device mxc_otg_udc_device;
+extern struct platform_device mxc_rnga_device;
+