ARM: dts: dra72-evm: Add regulator information to USB2 PHYs

The ldo4_reg regulator provides power to the USB1 and USB2
High Speed PHYs.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dra72-evm.dts

@@ -270,6 +270,14 @@
 	};
 };
 
+&usb2_phy1 {
+	phy-supply = <&ldo4_reg>;
+};
+
+&usb2_phy2 {
+	phy-supply = <&ldo4_reg>;
+};
+
 &usb1 {
 	dr_mode = "peripheral";
 	pinctrl-names = "default";