ARM: dts: imx25-pdk: Add USB OTG support

Tested by loading the g_ether module and doing a ping between mx25pdk and the
host PC via USB.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx25-pdk.dts

@@ -248,3 +248,10 @@ &usbhost1 {
 	dr_mode = "host";
 	status = "okay";
 };
+
+&usbotg {
+	phy_type = "utmi";
+	dr_mode = "otg";
+	external-vbus-divider;
+	status = "okay";
+};