Add device mgt service methods

components/mobile-plugins/android-plugin/org.wso2.carbon.device.mgt.mobile.android.api/src/test/java/org/wso2/carbon/mdm/services/android/mocks/DeviceManagementProviderServiceMock.java

@@ -797,4 +797,7 @@ public class DeviceManagementProviderServiceMock implements DeviceManagementProv
             throws OperationManagementException {
         return 0;
     }
+
+    @Override
+    public License getLicenseConfig(String s) throws DeviceManagementException { return null; }
 }

components/mobile-plugins/android-plugin/org.wso2.carbon.device.mgt.mobile.android/src/main/java/org/wso2/carbon/device/mgt/mobile/android/impl/AndroidDeviceManagementService.java

@@ -32,6 +32,7 @@ import org.wso2.carbon.device.mgt.common.configuration.mgt.PlatformConfiguration
 import org.wso2.carbon.device.mgt.common.exceptions.DeviceManagementException;
 import org.wso2.carbon.device.mgt.common.general.GeneralConfig;
 import org.wso2.carbon.device.mgt.common.invitation.mgt.DeviceEnrollmentInvitationDetails;
+import org.wso2.carbon.device.mgt.common.license.mgt.License;
 import org.wso2.carbon.device.mgt.common.policy.mgt.PolicyMonitoringManager;
 import org.wso2.carbon.device.mgt.common.pull.notification.PullNotificationSubscriber;
 import org.wso2.carbon.device.mgt.common.push.notification.PushNotificationConfig;
@@ -153,6 +154,9 @@ public class AndroidDeviceManagementService implements DeviceManagementService {
 
     @Override public DeviceEnrollmentInvitationDetails getDeviceEnrollmentInvitationDetails() { return null; }
 
+    @Override
+    public License getLicenseConfig() { return null; }
+
     private String getConfigProperty(List<ConfigurationEntry> configs, String propertyName) {
         for (ConfigurationEntry entry : configs) {
             if (propertyName.equals(entry.getName())) {