修改版权头说明

Signed-off-by: Nzhao_zhen_zhou <zhaozhenzhou@huawei.com>

BUILD.gn

-# Copyright (C) Huawei Technologies Co., Ltd. 2020-2020. All rights reserved.
+# Copyright (c) 2020-2022 Huawei Device Co., Ltd.
+# 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.
 
 import("//build/ohos.gni")