message: MVN support through nGraph
diff: @@ -119,8 +119,10 @@ public:
  virtual bool supportBackend(int backendId) CV_OVERRIDE
  {
  #ifdef HAVE_INF_ENGINE
  - if (backendId == DNN_BACKEND_INFERENCE_ENGINE_NN_BUILDER_2019 || backendId == DNN_BACKEND_INFERENCE_ENGINE_NGRAPH)
  + if (backendId == DNN_BACKEND_INFERENCE_ENGINE_NN_BUILDER_2019)
  return !zeroDev && (preferableTarget != DNN_TARGET_MYRIAD || eps <= 1e-7f);
  + else if (backendId == DNN_BACKEND_INFERENCE_ENGINE_NGRAPH)
  + return true;
  else
  #endif // HAVE_INF_ENGINE
  return backendId == DNN_BACKEND_OPENCV;
  