ARM: dts: am437x-gp-evm: remove unneded unit name

This patch fixes the following DTC warnings for am437x-gp-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>
diff --git a/arch/arm/boot/dts/am437x-gp-evm.dts b/arch/arm/boot/dts/am437x-gp-evm.dts
index 84832bf..14677d5 100644
--- a/arch/arm/boot/dts/am437x-gp-evm.dts
+++ b/arch/arm/boot/dts/am437x-gp-evm.dts
@@ -897,7 +897,7 @@
 	pinctrl-0 = <&dss_pins>;
 
 	port {
-		dpi_out: endpoint@0 {
+		dpi_out: endpoint {
 			remote-endpoint = <&lcd_in>;
 			data-lines = <24>;
 		};