message: dnn: add Vulkan device check for BackendRegistry
diff: @@ -137,7 +137,8 @@ private:
  backends.push_back(std::make_pair(DNN_BACKEND_OPENCV, DNN_TARGET_CPU));
  #ifdef HAVE_VULKAN
  - backends.push_back(std::make_pair(DNN_BACKEND_VKCOM, DNN_TARGET_VULKAN)); // TODO Add device check
  + if (haveVulkan())
  + backends.push_back(std::make_pair(DNN_BACKEND_VKCOM, DNN_TARGET_VULKAN));
  #endif
  }
  static inline bool checkIETarget(int target)
  