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Common i2c arbitration bus properties.

- i2c-arb child node

Required properties for the i2c-arb child node:
- #address-cells = <1>;
- #size-cells = <0>;

Optional properties for i2c-arb child node:
- Child nodes conforming to i2c bus binding


Example :

	/*
	   An NXP pca9541 I2C bus master selector at address 0x74
	   with a NXP pca8574 GPIO expander attached.
	 */

	arb@74 {
		compatible = "nxp,pca9541";
		reg = <0x74>;

		i2c-arb {
			#address-cells = <1>;
			#size-cells = <0>;

			gpio@38 {
				compatible = "nxp,pca8574";
				reg = <0x38>;
				#gpio-cells = <2>;
				gpio-controller;
			};
		};
	};