ARM: dts: rockchip: remove #phy-cells from usbphy node rk3066/rk3188

The review process of rockchip-usb-phy.yaml was not finished
when the patch in the link below was already applied.
Remove the unneeded #phy-cells property.

https://lore.kernel.org/r/[e-mail]

Fixes: 6e4e4e2a2558 ("ARM: dts: rockchip: move and restyle grf nodes rk3066/rk3188")
Signed-off-by: Johan Jonker <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Heiko Stuebner <[e-mail]>

arch/arm/boot/dts/rk3066a.dtsi

···
 	usbphy: usbphy {
 		compatible = "rockchip,rk3066a-usb-phy",
 			     "rockchip,rk3288-usb-phy";
-		#phy-cells = <0>;
 		#address-cells = <1>;
 		#size-cells = <0>;
 		status = "disabled";

arch/arm/boot/dts/rk3188.dtsi

···
 	usbphy: usbphy {
 		compatible = "rockchip,rk3188-usb-phy",
 			     "rockchip,rk3288-usb-phy";
-		#phy-cells = <0>;
 		#address-cells = <1>;
 		#size-cells = <0>;
 		status = "disabled";