intelmetool: Use GPLv2+ where possible

Upstream intelmetool is out of date; I suggest I archive it
instead of trying to merge coreboot's changes into it.

However I would like to preserve the licensing of files in the tool
as GPLv2+ where possible instead of GPLv2-only.

Change-Id: I47b1ff2734f54c65f4214b39244bd868ef44b83c
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/c/31587
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

util/intelmetool/Makefile

@@ -5,7 +5,7 @@
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
 # published by the Free Software Foundation; either version 2 of
-# the License, or any later version.
+# the License, or (at your option) any later version.
 
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of