Add Alarm Control Panel (#4770)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/core/controller.cpp

@@ -79,6 +79,12 @@ void Controller::setup_controller(bool include_internal) {
       obj->add_on_state_callback([this, obj]() { this->on_media_player_update(obj); });
   }
 #endif
+#ifdef USE_ALARM_CONTROL_PANEL
+  for (auto *obj : App.get_alarm_control_panels()) {
+    if (include_internal || !obj->is_internal())
+      obj->add_on_state_callback([this, obj]() { this->on_alarm_control_panel_update(obj); });
+  }
+#endif
 }
 
 }  // namespace esphome