ARM: dts: omap4-var-om44customboard: remove unneded unit name

This patch fixes the following DTC warnings for omap4-var-dvk-om44.dtb
and omap4-var-stk-om44.dtb:

"connector@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/omap4-var-om44customboard.dtsi

@@ -45,7 +45,7 @@ user-key@184 {
 		};
 	};
 
-	hdmi0: connector@0 {
+	hdmi0: connector {
 		compatible = "hdmi-connector";
 		pinctrl-names = "default";
 		pinctrl-0 = <&hdmi_hpd_pins>;