add load_mon support for Qurt platform (#22883)

- Added check in commander to see if CPU load monitoring has been disabled before signalling overload

src/modules/load_mon/LoadMon.cpp

@@ -229,6 +229,9 @@ void LoadMon::cpuload()
 	struct mallinfo mem = mallinfo();
 	cpuload.ram_usage = (float)mem.uordblks / mem.arena;
 	cpuload.load = 1.f - interval_idletime / interval;
+#elif defined(__PX4_QURT)
+	cpuload.ram_usage = 0.0f;
+	cpuload.load = px4muorb_get_cpu_load() / 100.0f;
 #endif
 	cpuload.timestamp = hrt_absolute_time();