Remove NeonDepthwiseConv.h

paddle/function/neon/NeonDepthwiseConv.h

-/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
-
-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
-
-namespace paddle {
-
-namespace neon {
-
-template <int filterSize, int stride>
-struct DepthwiseConvKernel {};
-
-}  // namespace neon
-}  // namespace paddle