add images to virtual fire alarm

features/device-mgt-iot-virtualfirealarm-feature/org.wso2.carbon.device.mgt.iot.virtualfirealarm.feature/src/main/resources/jaggeryapps/devicemgt/app/units/cdmf.unit.device.type.virtual_firealarm.device-view/device-view.hbs

@@ -1,5 +1,5 @@
 {{#zone "device-thumbnail"}}
-    <img src="{{@unit.publicUri}}/images/thumb.png"/>
+    <img src="{{@unit.publicUri}}/images/firealarm-icon.png"/>
 {{/zone}}
 {{#zone "device-opetations"}}
     <div style="background: #11375B; color: #fff; padding: 10px; margin-bottom: 5px">

features/device-mgt-iot-virtualfirealarm-feature/org.wso2.carbon.device.mgt.iot.virtualfirealarm.feature/src/main/resources/jaggeryapps/devicemgt/app/units/cdmf.unit.device.type.virtual_firealarm.type-view/type-view.hbs

@@ -4,7 +4,7 @@
     <p class="margin-bottom-double light-grey ">Connect your Android device to the WSO2 device cloud.</p>
 </div>
 <div class="col-xs-12 col-sm-6 col-md-4 col-lg-4 padding-top">
-    <img src="{{@unit.publicUri}}/images/firealarm.png" class="img-responsive">
+    <img src="{{@unit.publicUri}}/images/firealarm-icon.png" class="img-responsive">
 </div>
 
 <div class="col-xs-12 col-sm-6 col-md-8 col-lg-8 padding-top">