ARM: dts: uniphier: Rename usb-phy node for USB2 to usb-controller

Actual phy nodes are each child node. The parent node should be
usb-controller node as a representation of the phy integration.
This applies to the devicetree for Pro4 SoC.

Signed-off-by: Kunihiko Hayashi <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]'
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/arm/boot/dts/uniphier-pro4.dtsi

···
 				compatible = "socionext,uniphier-pro4-pinctrl";
 			};
 
-			usb-phy {
+			usb-controller {
 				compatible = "socionext,uniphier-pro4-usb2-phy";
 				#address-cells = <1>;
 				#size-cells = <0>;