treewide: move copyrights and authors to AUTHORS

Also split "this is part of" line from copyright notices.

Change-Id: Ibc2446410bcb3104ead458b40a9ce7819c61a8eb
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41067
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>

src/commonlib/storage/bouncebuf.h

@@ -9,7 +9,8 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- *
+ */
+/*
  * Generic bounce buffer implementation
  */