AUTHORS: Move src/arch/arm 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.

Additional changes in this patch:
- Make sure files say that they're part of the coreboot project
- Move descriptions below the license header
- Fix some spacing

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: Id5f26a73f0df366651c076a94975bce1fb321b70
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34605
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

AUTHORS

@@ -2,13 +2,36 @@
 #
 # This does not necessarily list everyone who has contributed code, since in
 # some cases, their employer may be the copyright holder.  To see the full list
-# of contributors, see the revision history in source control.
-# git log --pretty=format:%an | sort | uniq
-#
+# of contributors, and their email addresses, see the revision history in source
+# control.
+# Run the below commands in the coreboot repo for additional information.
+# To see a list of contributors: git log --pretty=format:%an | sort | uniq
+# For patches adding or removing a name: git log -i -S "NAME" --source --all
 
 Alexander Couzens
+Alexandru Gagniuc
+Alex Züpke
+coresystems GmbH
+DENX Software Engineering
+Eric Biederman
+Free Software Foundation, Inc.
+Gary Jennejohn
+Google LLC
+Kshitij
+Marius Gröger
+MontaVista Software, Inc.
+Per Odlund
+Richard Woodruff
+Ronald G. Minnich
+Russell King
+Steve Magnani
+Syed Mohammed Khasim
+Texas Instruments
+The Linux Foundation
+Wolfgang Denk
 
 
 
 # Directories transferred
 src/acpi
+src/arch/arm