treewide: split off license text, remove extra copyright notices

Copyright notices are best stored in AUTHORS

Change-Id: Ib9025c58987ee2f7db600e038f5d3e4edc69aacc
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41203
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/drivers/aspeed/common/ast_mode_corebootfb.c b/src/drivers/aspeed/common/ast_mode_corebootfb.c
index 2ec85ac..071ff7f0 100644
--- a/src/drivers/aspeed/common/ast_mode_corebootfb.c
+++ b/src/drivers/aspeed/common/ast_mode_corebootfb.c
@@ -1,12 +1,4 @@
 /*
- * Copied from Linux drivers/gpu/drm/ast/ast_mode.c
- *
- * Copyright 2012 Red Hat Inc.
- * Parts based on xf86-video-ast
- * Copyright (c) 2005 ASPEED Technology Inc.
- * Copyright Dave Airlie <airlied@redhat.com>
- * Copyright 2019 9Elements Agency GmbH <patrick.rudolph@9elements.com>
- *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
@@ -29,6 +21,9 @@
  *
  */
 
+/*
+ * Copied from Linux drivers/gpu/drm/ast/ast_mode.c
+ */
 #include <edid.h>
 
 #include "ast_drv.h"