AUTHORS: Move src/cpu/amd 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: I77275adb7c15b242e319805b8a60b7755fa25db5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35180
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

AUTHORS

@@ -15,7 +15,9 @@ Alexander Couzens
 Alexandru Gagniuc
 Andy Fleming
 ARM Limited and Contributors
+Carl-Daniel Hailfinger
 coresystems GmbH
+Damien Zammit
 DENX Software Engineering
 Eric Biederman
 Facebook, Inc.
@@ -27,9 +29,11 @@ Imagination Technologies
 Intel Corporation
 Jordan Crouse
 Kshitij
+Kyösti Mälkki
 Lei Wen
 Libra Li
 Linus Torvalds
+Marc Jones
 Marek Vasut
 Marius Gröger
 Marvell Semiconductor Inc
@@ -38,7 +42,9 @@ Nicholas Sielicki
 Nick Barker
 Patrick Georgi
 Patrick Rudolph
+PC Engines GmbH
 Per Odlund
+Peter Stuge
 Raptor Engineering, LLC.
 Richard Woodruff
 Ronald G. Minnich
@@ -64,3 +70,4 @@ src/acpi
 src/arch
 src/commonlib
 src/console
+src/cpu/amd