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/exynos/fixed_cksum.py

@@ -1,7 +1,5 @@
 #!/usr/bin/env python2
 #
-# Copyright (C) 2013 Google Inc.
-#
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met: