samples: drivers: adc_dt: Add lp_em_cc2340r5 DT overlay

Add LP-EM-CC2340R5 board support to ADC sample.

Signed-off-by: Julien Panis <[email protected]>

Author: jpanisbl

samples/drivers/adc/adc_dt/boards/lp_em_cc2340r5.overlay

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2024 BayLibre, SAS
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/adc/adc.h>
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 0x2>;
+	};
+};
+
+&adc0 {
+	status = "okay";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@2 {
+		reg = <2>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,vref-mv = <3300>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+	};
+};