ARM: tegra: enable ums on nyan boards

This patch enables UMS on the nyan devices like the nyan-big.
A patch like this has been sent in by Stephen Warren some time ago for
other tegra devices: commit e6607cffef965011ef0ddc0fbe6f4b7c0d53aeec.
But the nyan devices never received that functionality.

Signed-off-by: Tristan Bastian <tristan-c.bastian@gmx.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/arch/arm/dts/tegra124-nyan.dtsi b/arch/arm/dts/tegra124-nyan.dtsi
index 51895e4..2b28fe1 100644
--- a/arch/arm/dts/tegra124-nyan.dtsi
+++ b/arch/arm/dts/tegra124-nyan.dtsi
@@ -414,6 +414,7 @@
 
 	usb@7d000000 { /* Rear external USB port. */
 		status = "okay";
+		dr_mode = "otg";
 		nvidia,vbus-gpio = <&gpio TEGRA_GPIO(N, 4) GPIO_ACTIVE_HIGH>;
 	};