ARM: dts: imx28-cfa10049: fix dtc warning

This fixes the following dtc warning by removing the unnecessary unit:

Warning (unit_address_vs_reg): Node /onewire@0 has a unit name,
but no reg property
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx28-cfa10049.dts

@@ -426,7 +426,7 @@ backlight {
 
 	};
 
-	onewire@0 {
+	onewire {
 		compatible = "w1-gpio";
 		pinctrl-names = "default";
 		pinctrl-0 = <&w1_gpio_pins>;