arm: dts: marvell: Add missing #phy-cells to usb-nop-xceiv

"usb-nop-xceiv" is using the phy binding, but is missing #phy-cells
property. This is probably because the binding was the precursor to the phy
binding.

Fixes the following warning in Marvell dts files:

Warning (phys_property): Missing property '#phy-cells' in node ...
Signed-off-by: NRob Herring <robh@kernel.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Acked-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>

arch/arm/boot/dts/armada-385-db-ap.dts

@@ -236,6 +236,7 @@
 	usb3_phy: usb3_phy {
 		compatible = "usb-nop-xceiv";
 		vcc-supply = <&reg_xhci0_vbus>;
+		#phy-cells = <0>;
 	};
 
 	reg_xhci0_vbus: xhci0-vbus {

arch/arm/boot/dts/armada-385-linksys.dtsi

@@ -66,6 +66,7 @@
 	usb3_1_phy: usb3_1-phy {
 		compatible = "usb-nop-xceiv";
 		vcc-supply = <&usb3_1_vbus>;
+		#phy-cells = <0>;
 	};
 
 	usb3_1_vbus: usb3_1-vbus {

arch/arm/boot/dts/armada-385-synology-ds116.dts

@@ -191,11 +191,13 @@
 	usb3_0_phy: usb3_0_phy {
 		compatible = "usb-nop-xceiv";
 		vcc-supply = <&reg_usb3_0_vbus>;
+		#phy-cells = <0>;
 	};
 
 	usb3_1_phy: usb3_1_phy {
 		compatible = "usb-nop-xceiv";
 		vcc-supply = <&reg_usb3_1_vbus>;
+		#phy-cells = <0>;
 	};
 
 	reg_usb3_0_vbus: usb3-vbus0 {

arch/arm/boot/dts/armada-388-gp.dts

@@ -276,11 +276,13 @@
 	usb2_1_phy: usb2_1_phy {
 		compatible = "usb-nop-xceiv";
 		vcc-supply = <&reg_usb2_1_vbus>;
+		#phy-cells = <0>;
 	};
 
 	usb3_phy: usb3_phy {
 		compatible = "usb-nop-xceiv";
 		vcc-supply = <&reg_usb3_vbus>;
+		#phy-cells = <0>;
 	};
 
 	reg_usb3_vbus: usb3-vbus {