dt-bindings: phy-lpc18xx-usb-otg: remove unit address from binding

DT bindings should either use a unit address and a reg property
or none of them. Since either of them aren't really useful for
such a simple device like this one remove the unit address.

Signed-off-by: Joachim Eastwood <[e-mail]>
Acked-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/phy/phy-lpc18xx-usb-otg.txt

···
 	compatible = "nxp,lpc1850-creg", "syscon", "simple-mfd";
 	reg = <0x40043000 0x1000>;
 
-	usb0_otg_phy: phy@004 {
+	usb0_otg_phy: phy {
 		compatible = "nxp,lpc1850-usb-otg-phy";
 		clocks = <&ccu1 CLK_USB0>;
 		#phy-cells = <0>;