ARM: dts: samsung: exynos5250-snow: switch i2c-arb to new child variant

Since commit e8813c1 ("dt-bindings: i2c: add support for 'i2c-arb'
subnode") the i2c-arbitrator subnode should not have unit address.

Link: https://lore.kernel.org/r/20230721133246.15752-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

arch/arm/boot/dts/samsung/exynos5250-snow-common.dtsi

@@ -60,9 +60,6 @@
 
 	i2c-arbitrator {
 		compatible = "i2c-arb-gpio-challenge";
-		#address-cells = <1>;
-		#size-cells = <0>;
-
 		i2c-parent = <&i2c_4>;
 
 		our-claim-gpios = <&gpf0 3 GPIO_ACTIVE_LOW>;
@@ -75,8 +72,7 @@
 		pinctrl-0 = <&arb_our_claim &arb_their_claim>;
 
 		/* Use ID 104 as a hint that we're on physical bus 4 */
-		i2c_104: i2c@0 {
-			reg = <0>;
+		i2c_104: i2c-arb {
 			#address-cells = <1>;
 			#size-cells = <0>;