Update oneDNN spec to beta6 content

(cherry picked from commit c8e24b6)

Author: Roman Dubtsov

source/elements/oneDNN/include/dnnl.h

@@ -0,0 +1,22 @@
+/*******************************************************************************
+* Copyright 2016-2020 Intel Corporation
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* 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.
+*******************************************************************************/
+
+#ifndef DNNL_H
+#define DNNL_H
+
+#include "dnnl_types.h"
+
+#endif