few changes after testing the configs

components/iot-plugins/virtual-fire-alarm-plugin/org.wso2.carbon.device.mgt.iot.virtualfirealarm.plugin/src/main/java/org/wso2/carbon/device/mgt/iot/virtualfirealarm/plugin/config/DeviceManagementConfiguration.java

@@ -34,7 +34,7 @@ public class DeviceManagementConfiguration {
     private DeviceManagementConfiguration() {
     }
 
-    @XmlElement(name = "PushNotificationConfiguration", required = false)
+    @XmlElement(name = "EventListenerConfiguration", required = false)
     public EventListenerConfiguration getEventListenerConfiguration() {
         return eventListenerConfiguration;
     }