message: Fix missed dpcpp kernel
diff: @@ -327,7 +327,7 @@ GKO_INSTANTIATE_FOR_EACH_VALUE_TYPE(GKO_DECLARE_GET_REAL_KERNEL);
  template <typename ValueType>
  -void get_imag(std::shared_ptr<const CudaExecutor> exec,
  +void get_imag(std::shared_ptr<const DpcppExecutor> exec,
  const matrix::Dense<ValueType> *source,
  matrix::Dense<remove_complex<ValueType>> *result)
  GKO_NOT_IMPLEMENTED;
  