src: Drop "This file is part of the coreboot project" lines

Commit 6b5bc77c9b (treewide: Remove "this
file is part of" lines) removed most of them, but missed some files.

Change-Id: Ib8e7ab26a74b52f86d91faeba77df3331531763f
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/53976
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/vendorcode/amd/agesa/Kconfig

@@ -1,5 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
-# This file is part of the coreboot project.
 
 choice
 	prompt "DDR3 memory profile"