tests: drivers: adc: Add support test ADC for ek_ra4c1

Add support test app adc_accuracy_test and adc_api for ek_ra4c1

Signed-off-by: Khoa Nguyen <[email protected]>

Author: khoa-nguyen-18

tests/drivers/adc/adc_accuracy_test/boards/ek_ra4c1.overlay

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 0>;
+		reference-mv = <3300>;
+		expected-accuracy = <32>;
+	};
+};
+
+&adc0{
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+		zephyr,vref-mv = <3300>;
+	};
+};

tests/drivers/adc/adc_api/boards/ek_ra4c1.overlay

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 0>, <&adc0 2>;
+	};
+};
+
+&adc0 {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,resolution = <12>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,vref-mv = <3300>;
+	};
+
+	channel@2 {
+		reg = <2>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,resolution = <12>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,vref-mv = <3300>;
+	};
+};