remove useless pten kernel (#41224)

paddle/pten/kernels/slice_kernel.h

-// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
-//
-// 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
-
-#include "paddle/phi/common/int_array.h"
-#include "paddle/phi/core/dense_tensor.h"
-
-namespace phi {
-
-template <typename T, typename Context>
-void SliceRawKernel(const Context& ctx,
-                    const DenseTensor& input,
-                    const std::vector<int64_t>& axes,
-                    const IntArray& starts,
-                    const IntArray& ends,
-                    const std::vector<int64_t>& infer_flags,
-                    const std::vector<int64_t>& decrease_axis,
-                    DenseTensor* out);
-
-}  // namespace phi