tests: drivers: adc: Add MAX32680EVKIT overlay file

Add board overlay file for the MAX32680EVKIT.

Signed-off-by: Tahsin Mutlugun <Tahsin.Mutlugun@analog.com>

Author: ttmut

tests/drivers/adc/adc_api/boards/max32680evkit_max32680_m4.overlay

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2024 Analog Devices, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		/* adjust channel number according to pinmux in board.dts */
+		io-channels = <&adc 4>, <&adc 5>;
+	};
+};
+
+&adc {
+	status = "okay";
+	pinctrl-0 = <&ain12_p2_4 &ain13_p2_5>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@4 {
+		reg = <4>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <10>;
+	};
+
+	channel@5 {
+		reg = <5>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <10>;
+	};
+};