cpu/amd/geode_lx: Trivial - remove useless comment

Change-Id: I4b04f84fb2be7da4b7ffab71bb2c41142f455440
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/6567
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Tested-by: build bot (Jenkins)