ARM: tegra: Fix I2C mux reset GPIO reference on Cardhu

Use the correct "reset-gpios" property for the I2C mux reset GPIO
reference instead of the deprecated "reset-gpio" property.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30-cardhu.dtsi

@@ -210,7 +210,7 @@ i2cmux@70 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <0x70>;
-			reset-gpio = <&gpio TEGRA_GPIO(BB, 0) GPIO_ACTIVE_LOW>;
+			reset-gpios = <&gpio TEGRA_GPIO(BB, 0) GPIO_ACTIVE_LOW>;
 		};
 	};