tests: drivers: adc: adc_api: Add overlay for nucleo_f072rb

It's a copy of `nucleo_f070rb.overlay`.

Signed-off-by: Grzegorz Swiderski <[email protected]>

Author: 57300

tests/drivers/adc/adc_api/boards/nucleo_f072rb.overlay

@@ -0,0 +1,25 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (c) 2023 STMicroelectronics
+ */
+
+/ {
+	zephyr,user {
+		/* adjust channel number according to pinmux in board.dts */
+		io-channels = <&adc1 0>;
+	};
+};
+
+&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>;
+	};
+};