message: Add ListPhysicalDevices to SYCLDeviceFactory
diff: @@ -24,8 +24,12 @@ namespace tensorflow {
  class SYCLDeviceFactory : public DeviceFactory {
  public:
  + Status ListPhysicalDevices(std::vector<string>* devices) override {
  + return tensorflow::Status::OK();
  + }
  +
  Status CreateDevices(const SessionOptions& options, const string& name_prefix,
  - std::vector<Device *> *devices) override {
  + std::vector<std::unique_ptr<Device>>* devices) override {
  auto syclInterface = GSYCLInterface::instance();
  size_t n = 1;
  