ARM: dts: at91: ariag25 : fix onewire node

Remove the unit-address from the oneiwire node as it doesn't have a reg
property.

Solves:
Warning (unit_address_vs_reg): Node /onewire@0 has a unit name, but no reg property
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/boot/dts/at91-ariag25.dts

@@ -169,7 +169,7 @@ aria_led {
 
 	};
 
-	onewire@0 {
+	onewire {
 		compatible = "w1-gpio";
 		gpios = <&pioA 21 GPIO_ACTIVE_LOW>;
 		pinctrl-names = "default";