arm64: dts: rockchip: use just "port" in panel on Pinebook Pro

The panel bindings expect to have only one port, thus they do not allow
to use "ports" node:

  rk3399-pinebook-pro.dtb: edp-panel: 'ports' does not match any of the regexes: 'pinctrl-[0-9]+'
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230326204520.80859-2-krzysztof.kozlowski@linaro.orgSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts

@@ -50,19 +50,9 @@ edp_panel: edp-panel {
 		pinctrl-0 = <&panel_en_pin>;
 		power-supply = <&vcc3v3_panel>;
 
-		ports {
-			#address-cells = <1>;
-			#size-cells = <0>;
-
-			port@0 {
-				reg = <0>;
-				#address-cells = <1>;
-				#size-cells = <0>;
-
-				panel_in_edp: endpoint@0 {
-					reg = <0>;
-					remote-endpoint = <&edp_out_panel>;
-				};
+		port {
+			panel_in_edp: endpoint {
+				remote-endpoint = <&edp_out_panel>;
 			};
 		};
 	};