arm64: dts: rockchip: drop panel port unit address in GRU Scarlet

Panel port does not have "reg", thus it should not have unit address, as
reported by dtc W=1 warning:

  rk3399-gru-scarlet.dtsi:666.32-668.7: Warning (unit_address_vs_reg): /dsi@ff960000/panel@0/ports/port@1/endpoint@1: node has a unit name, but no reg or ranges property
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240401140939.97808-1-krzk@kernel.orgSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet.dtsi

@@ -663,7 +663,7 @@ mipi_in_panel: endpoint {
 			port@1 {
 				reg = <1>;
 
-				mipi1_in_panel: endpoint@1 {
+				mipi1_in_panel: endpoint {
 					remote-endpoint = <&mipi1_out_panel>;
 				};
 			};