Add missing license header from generate_command_help.py.

Author: flit

scripts/generate_command_help.py

@@ -1,5 +1,21 @@
 #!/usr/bin/env python3
 
+# Copyright (c) 2020 Arm Limited
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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.
+
+# These modules must be imported in order to load the commands into the ALL_COMMANDS table.
 import pyocd.commands.commands
 import pyocd.commands.values
 from pyocd.commands.base import (