Merge https://source.denx.de/u-boot/custodians/u-boot-watchdog

- nuvoton: add expire function for generic reset (Jim)
- handle watchdogs during keyed autoboot (Rasmus)
- cyclic: Don't disable cylic function upon exceeding CPU time (Stefan)
- ulp wdog: Updates to support iMX93 and DM (Alice)

arch/sandbox/cpu/os.c

@@ -130,6 +130,23 @@ void os_exit(int exit_code)
 	exit(exit_code);
 }
 
+unsigned int os_alarm(unsigned int seconds)
+{
+	return alarm(seconds);
+}
+
+void os_set_alarm_handler(void (*handler)(int))
+{
+	if (!handler)
+		handler = SIG_DFL;
+	signal(SIGALRM, handler);
+}
+
+void os_raise_sigalrm(void)
+{
+	raise(SIGALRM);
+}
+
 int os_write_file(const char *fname, const void *buf, int size)
 {
 	int fd;

arch/sandbox/dts/sandbox.dtsi

@@ -27,6 +27,12 @@
 		};
 	};
 
+	alarm_wdt: alarm-wdt {
+		compatible = "sandbox,alarm-wdt";
+		timeout-sec = <5>;
+		u-boot,autostart;
+	};
+
 	audio: audio-codec {
 		compatible = "sandbox,audio-codec";
 		#sound-dai-cells = <1>;