AMD: Kconfig cleanup

Change-Id: Ie347b32575c26133d52c275622d29d1cd4c6c0c7
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3623
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
10 files changed