scripts: Make REUSE compliant

Test: pipx run reuse lint
Change-Id: I73a60c421ec2d4399d511043e92d387dc890eb3d

fbpacktool/packedstruct.py

@@ -1,17 +1,5 @@
-# Copyright 2021 The Android Open Source Project
-#
-# 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.
-#
+# SPDX-FileCopyrightText: 2021 The Android Open Source Project
+# SPDX-License-Identifier: Apache-2.0
 import collections
 import struct