ARM: dts: am43xx-epos-evm: remove unneded unit name

This patch fixes the following DTC warnings for am43xx-epos-evm.dtb:

"endpoint@0 has a unit name, but no reg property"
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am43x-epos-evm.dts

@@ -754,7 +754,7 @@ &dss {
 	pinctrl-0 = <&dss_pins>;
 
 	port {
-		dpi_out: endpoint@0 {
+		dpi_out: endpoint {
 			remote-endpoint = <&lcd_in>;
 			data-lines = <24>;
 		};