tests: drivers: adc: add imx93_evk support for adc_api case

Add necessary configuration for sar_adc1 on imx93 core cm33
There are some issues with USERSPACE, so add an overlay to
disable CONFIG_TEST_USERSPACE, will drop it once it works.

Signed-off-by: Qiang Zhao <qiang.zhao@nxp.com>

Author: ZhaoQiang-b45475

tests/drivers/adc/adc_api/boards/imx93_evk_mimx9352_m33.conf

@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2025, NXP
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+CONFIG_TEST_USERSPACE=n

tests/drivers/adc/adc_api/boards/imx93_evk_mimx9352_m33.overlay

@@ -0,0 +1,34 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright 2025 NXP
+ */
+
+#include <zephyr/dt-bindings/adc/adc.h>
+
+/ {
+	zephyr,user {
+		io-channels = <&sar_adc1 0>, <&sar_adc1 1>;
+	};
+};
+
+&sar_adc1 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+	};
+
+	channel@1 {
+		reg = <1>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+	};
+};