boards: frdm_mcxa156: add temperature sensor support

1. enable temperature sensor support
2. verified samples/sensor/die_temp_polling

Signed-off-by: Neil Chen <[email protected]>

Author: NeilChen93

boards/nxp/frdm_mcxa156/frdm_mcxa156.dts

@@ -25,6 +25,7 @@
 		mcuboot-button0 = &user_button_2;
 		watchdog0 = &wwdt0;
 		ambient-temp0 = &p3t1755;
+		die-temp0 = &temp0;
 	};
 
 	chosen {

dts/arm/nxp/nxp_mcxa156.dtsi

@@ -493,6 +493,11 @@
 			status = "disabled";
 		};
 
+		temp0: temp0 {
+			compatible = "nxp,lpadc-temp40";
+			status = "disabled";
+		};
+
 		usb: usbd@400a4000 {
 			compatible = "nxp,kinetis-usbd";
 			reg = <0x400a4000 0x1000>;

samples/sensor/die_temp_polling/boards/frdm_mcxa156.overlay

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <zephyr/dt-bindings/adc/adc.h>
+#include <zephyr/dt-bindings/adc/mcux-lpadc.h>
+
+&lpadc0 {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_EXTERNAL0";
+		zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_TICKS, 131)>;
+		zephyr,input-positive = <MCUX_LPADC_CH26A>;
+	};
+};
+
+&temp0 {
+	status = "okay";
+	io-channels = <&lpadc0 0>;
+};