ARM: dts: am335x: drop panel endpoint unit address

The endpoint in panel port node should not have unit address:

  am335x-evmsk.dtb: panel: port:endpoint@0: 'reg' is a required property
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20220810130212.400371-1-krzysztof.kozlowski@linaro.org

arch/arm/boot/dts/am335x-evm.dts

@@ -126,7 +126,7 @@ panel {
 		backlight = <&backlight>;
 
 		port {
-			panel_0: endpoint@0 {
+			panel_0: endpoint {
 				remote-endpoint = <&lcdc_0>;
 			};
 		};

arch/arm/boot/dts/am335x-evmsk.dts

@@ -191,7 +191,7 @@ panel {
 		backlight = <&lcd_bl>;
 
 		port {
-			panel_0: endpoint@0 {
+			panel_0: endpoint {
 				remote-endpoint = <&lcdc_0>;
 			};
 		};