AUTHORS: Move src/acpi copyrights into AUTHORS file

As discussed on the mailing list and voted upon, the coreboot project
is going to move the majority of copyrights out of the headers and into
an AUTHORS file.  This will happen a bit at a time, as we'll be unifying
license headers at the same time.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: Id3382d19088cba2703350339b0bd0cfb3c0e63b2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34604
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/acpi/sata.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2015 Alexander Couzens <lynxis@fe80.eu>
+ * This file is part of the coreboot project.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as