arm64: dts: rockchip: fix rk3399 dp node

Use generic node name for rk3399.dtsi dp node.
With the conversion of rockchip,analogix-dp.yaml a port@1 node
is required, so add a node with label edp_out.
Also restyle.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/f6008819-db9b-0944-3f5b-5522b7cd8a8d@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -2037,7 +2037,7 @@
 		};
 	};
 
-	edp: edp@ff970000 {
+	edp: dp@ff970000 {
 		compatible = "rockchip,rk3399-edp";
 		reg = <0x0 0xff970000 0x0 0x8000>;
 		interrupts = <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH 0>;
@@ -2054,6 +2054,7 @@
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
+
 			edp_in: port@0 {
 				reg = <0>;
 				#address-cells = <1>;
@@ -2069,6 +2070,10 @@
 					remote-endpoint = <&vopl_out_edp>;
 				};
 			};
+
+			edp_out: port@1 {
+				reg = <1>;
+			};
 		};
 	};