Remove duplicate copyright headers

I used the "Arm Limited" spelling in some headers, but it seems that
didn't get caught by the copyright update script that was used for
9fd690efb3 ("Update copyrights").

This resulted in a duplicated header being inserted, although with the
"ARM Limited" spelling. Remove the previous header and use this one
instead.

devlib/module/sched.py

@@ -13,20 +13,6 @@
 # limitations under the License.
 #
 
-#    Copyright 2018 Arm Limited
-#
-# 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 logging
 import re
 

devlib/trace/systrace.py

@@ -13,21 +13,6 @@
 # limitations under the License.
 #
 
-#    Copyright 2018 Arm Limited
-#
-# 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 os
 import subprocess