dts: nxp_mcxn23x: Add power-states for MCXN23x devices

1. Add power-states for MCXN23x devices
2. Add power management related device nodes to MCXN23x,
including spc, cmc vbat, and wuu.
3. Add 'zephyr,cortex-m-idle-timer' node in frdm_mcxn236.dts

Signed-off-by: Zhaoxiang Jin <Zhaoxiang.Jin_1@nxp.com>

Author: ZhaoxiangJin

boards/nxp/frdm_mcxn236/frdm_mcxn236.dts

@@ -27,6 +27,7 @@
 		zephyr,shell-uart = &flexcomm4_lpuart4;
 		zephyr,canbus = &flexcan1;
 		zephyr,edac = &erm0;
+		zephyr,cortex-m-idle-timer = &lptmr0;
 	};
 
 	aliases {

dts/arm/nxp/nxp_mcxn23x_common.dtsi

@@ -22,6 +22,7 @@
 			reg = <0>;
 			#address-cells = <1>;
 			#size-cells = <1>;
+			cpu-power-states = <&sleep &deepsleep &powerdown>;
 
 			mpu: mpu@e000ed90 {
 				compatible = "arm,armv8m-mpu";
@@ -50,6 +51,36 @@
 		};
 	};
 
+	power-states {
+		/*
+		 * Note:
+		 *  - 'exit-latency-us' depends on system clock frequency and voltage level.
+		 *  - 'min-residency-us' needs to be adjusted according to the actual project
+		 *    requirements. The values provided here are not applicable to all real
+		 *    projects.
+		 */
+		sleep: sleep {
+			compatible = "zephyr,power-state";
+			power-state-name = "runtime-idle";
+			min-residency-us = <10000>;
+			exit-latency-us = <1>;
+		};
+
+		deepsleep: deepsleep {
+			compatible = "zephyr,power-state";
+			power-state-name = "suspend-to-idle";
+			min-residency-us = <50000>;
+			exit-latency-us = <10>;
+		};
+
+		powerdown: powerdown {
+			compatible = "zephyr,power-state";
+			power-state-name = "standby";
+			min-residency-us = <80000>;
+			exit-latency-us = <20>;
+		};
+	};
+
 	pinctrl: pinctrl {
 		compatible = "nxp,port-pinctrl";
 		status = "okay";
@@ -1105,6 +1136,31 @@
 			decimation-filter-gain = <4>;
 		};
 	};
+
+	spc: system-modules@45000 {
+		compatible = "nxp,spc";
+		reg = <0x45000 0x1000>;
+		interrupts = <146 0>;
+		wakeup-delay = <780>;
+	};
+
+	wuu: system-modules@46000 {
+		compatible = "nxp,wuu";
+		reg = <0x46000 0x1000>;
+		interrupts = <147 0>;
+	};
+
+	cmc: system-modules@48000 {
+		compatible = "nxp,cmc";
+		reg = <0x48000 0x1000>;
+		interrupts = <154 0>;
+	};
+
+	vbat: system-modules@59000 {
+		compatible = "nxp,vbat";
+		reg = <0x59000 0x1000>;
+		interrupts = <99 0>;
+	};
 };
 
 &systick {