ARM: tegra: Enable UDC on Jetson TK1

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

arch/arm/boot/dts/tegra124-jetson-tk1.dts

@@ -1722,7 +1722,7 @@
 
 				lanes {
 					usb2-0 {
-						nvidia,function = "xusb";
+						nvidia,function = "snps";
 						status = "okay";
 					};
 
@@ -1829,6 +1829,16 @@
 		};
 	};
 
+	usb@7d000000 {
+		compatible = "nvidia,tegra124-udc";
+		status = "okay";
+		dr_mode = "peripheral";
+	};
+
+	usb-phy@7d000000 {
+		status = "okay";
+	};
+
 	/* mini-PCIe USB */
 	usb@7d004000 {
 		status = "okay";