ARM: tegra: Enable UDC on Beaver

Override the compatible string of the first USB controller to enable
device mode.
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30-beaver.dts

@@ -1927,6 +1927,16 @@
 		non-removable;
 	};
 
+	usb@7d000000 {
+		compatible = "nvidia,tegra30-udc";
+		status = "okay";
+		dr_mode = "peripheral";
+	};
+
+	usb-phy@7d000000 {
+		status = "okay";
+	};
+
 	usb@7d004000 {
 		status = "okay";
 	};