Update license boilerplate text in source code files

Normally we don't do this, but enough changes have accumulated that
we're doing a tree-wide one-off update of the name & style.

BUG=chromium:1098010
TEST=`repo upload` works

Change-Id: Icb42e5012a87920c2cd13b666fb3e55e7e4fb3b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/3891080
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
diff --git a/lock_machine.py b/lock_machine.py
index e7befdb..5c2bedb 100755
--- a/lock_machine.py
+++ b/lock_machine.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
-# Copyright 2019 The ChromiumOS Authors. All rights reserved.
+# Copyright 2019 The ChromiumOS Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.