ARM: dts: n8x0: remove unneeded unit name for i2c node

This patch fixes the following DTC warnings:

"i2c@0 has a unit name, but no reg property"
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap2420-n8x0-common.dtsi

@@ -7,7 +7,7 @@
 	};
 
 	ocp {
-		i2c@0 {
+		i2c0 {
 			compatible = "i2c-cbus-gpio";
 			gpios = <&gpio3 2 GPIO_ACTIVE_HIGH /* gpio66 clk */
 				 &gpio3 1 GPIO_ACTIVE_HIGH /* gpio65 dat */