AUTHORS, util/: Drop individual copyright notices

We have the git history which is a more reliable librarian.

Change-Id: Idbcc5ceeb33804204e56d62491cb58146f7c9f37
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41175
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: ron minnich <rminnich@gmail.com>

util/gitconfig/test/commit-message-hook.sh

@@ -1,10 +1,6 @@
 #!/bin/bash
-
-##
 ## This file is part of the coreboot project.
 ##
-## Copyright (C) 2003-2018 Alex Thiessen <alex.thiessen.de+coreboot@gmail.com>
-##
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
 ## the Free Software Foundation; version 3 or later of the License.