tests: drivers: adc: adc_api: update adc_api test

/*

 * SPDX-License-Identifier: Apache-2.0

 *

 * Copyright (c) 2025 STMicroelectronics

 */

/ {

	zephyr,user {

		/* adjust channel number according to pinmux in board.dts */

		io-channels = <&adc4 7>, <&adc4 8>;

	};

};

&adc4 {

	pinctrl-0 = <&adc4_in7_pa2 &adc4_in8_pa1>;

	#address-cells = <1>;

	#size-cells = <0>;

	channel@7 {

		reg = <7>;

		zephyr,gain = "ADC_GAIN_1";

		zephyr,reference = "ADC_REF_INTERNAL";

		zephyr,acquisition-time = <ADC_ACQ_TIME_MAX>;

		zephyr,resolution = <12>;

	};

	channel@8 {

		reg = <8>;

		zephyr,gain = "ADC_GAIN_1";

		zephyr,reference = "ADC_REF_INTERNAL";

		zephyr,acquisition-time = <ADC_ACQ_TIME_MAX>;

		zephyr,resolution = <12>;

	};

};

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