tests: drivers: adc: Add support for RZ/G3S-SMARC

Add test support for ADC driver of RZ/G3S-SMARC

Signed-off-by: Phuc Pham <phuc.pham.xr@bp.renesas.com>
Signed-off-by: Binh Nguyen <binh.nguyen.xw@renesas.com>

Author: Phuc Pham

tests/drivers/adc/adc_api/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.overlay

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2024 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+/ {
+	zephyr,user {
+		io-channels = <&adc 0>, <&adc 2>;
+	};
+};
+
+&adc {
+	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 = <1800>;
+	};
+
+	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 = <1800>;
+	};
+};