ARM: dts: tegra30: enable USB PHY node on some devices

Enable USB PHY nodes on ASUS Transformers, Grouper, Enadevoru
and LG X3. This is not mandatory since driver will use default
values but preferable for new devices.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/arch/arm/dts/tegra30-asus-tf600t.dts b/arch/arm/dts/tegra30-asus-tf600t.dts
index efc6a83..3f11d33 100644
--- a/arch/arm/dts/tegra30-asus-tf600t.dts
+++ b/arch/arm/dts/tegra30-asus-tf600t.dts
@@ -165,11 +165,22 @@
 		dr_mode = "otg";
 	};
 
+	usb-phy@7d000000 {
+		status = "okay";
+		nvidia,hssync-start-delay = <0>;
+		nvidia,xcvr-lsfslew = <2>;
+		nvidia,xcvr-lsrslew = <2>;
+	};
+
 	/* Dock's USB port */
 	usb3: usb@7d008000 {
 		status = "okay";
 	};
 
+	usb-phy@7d008000 {
+		status = "okay";
+	};
+
 	backlight: backlight {
 		compatible = "pwm-backlight";