Merge branch 'device-delete-db-fix' into 'master'

Fix issue in iOS and Windows policy creation

See merge request entgra/carbon-device-mgt!553

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/util/RequestValidationUtil.java

@@ -348,8 +348,12 @@ public class RequestValidationUtil {
                     return enrollmentNotifier.validate(features);
                 case Constants.IOS:
                     //todo
+                    features = new ArrayList<>();
+                    break;
                 case Constants.WINDOWS:
                     //todo
+                    features = new ArrayList<>();
+                    break;
                 default:
                     log.error("No policy validator found for device type  " + deviceType);
                     break;