fix copyright header (#497)

src/ngraph/runtime/gpu/gpu_util.hpp

-// ----------------------------------------------------------------------------
-// copyright 2017 nervana systems inc.
-// 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
-// ----------------------------------------------------------------------------
+/*******************************************************************************
+* Copyright 2017-2018 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.
+*******************************************************************************/
 
 #pragma once