dts:mc3: Added ADC chip to I2C

The ADC chip is detected on the bus but probing fails at the moment.
It seems that the driver tries to send the wrong setup and config bytes
to the chip. Further investigation is required.

BCS 746-001092

arch/arm64/boot/dts/seconorth/mc3.dtsi

@@ -437,6 +437,18 @@ rtc: rtc@32 {
 		pinctrl-0 = <&pinctrl_rtc>;
 		reg = <0x32>;
 	};
+
+	/*
+	 * The ADC chip is detected on the bus but probing
+	 * fails at the moment.
+	 * It seems that the driver tries to send the wrong
+	 * setup and config bytes to the chip. Further
+	 * investigation is required.
+	 */
+	adc: max11601@64 {
+		compatible = "maxim,max11601";
+		reg = <0x64>;
+	};
 };
 
 &i2c2 {