Update activation_op.cc

test=develop

paddle/fluid/operators/activation_op.cc

@@ -12,6 +12,8 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. */
 
+#include <memory>
+#include <unordered_map>
 #include "paddle/fluid/operators/activation_op.h"
 #include <string>
 #include "paddle/fluid/operators/mkldnn/mkldnn_activation_op.h"