[nrf fromtree] tests: adc_accuracy: Add overlay for nrf54h20dk.

Add overlay and enable test for nrf54h20dk.

Signed-off-by: Bartlomiej Buczek <[email protected]>
(cherry picked from commit d4c8b35)

Author: nordic-babu

tests/drivers/adc/adc_accuracy_test/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

@@ -0,0 +1,26 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ */
+
+/ {
+	zephyr,user {
+		io-channels = <&adc 0>;
+		reference_mv = <1800>;
+	};
+};
+
+&adc {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1_2";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,input-positive = <NRF_SAADC_AIN4>;
+		zephyr,resolution = <14>;
+	};
+};

tests/drivers/adc/adc_accuracy_test/testcase.yaml

@@ -21,3 +21,4 @@ tests:
       - ek_ra8m1
       - frdm_mcxc242
       - nrf52840dk/nrf52840
+      - nrf54h20dk/nrf54h20/cpuapp