util/inteltool: fix typo

Change-Id: I8c30742f6cd759dce4c9641edad107d9e3154975
Signed-off-by: Idwer Vollering <vidwer@gmail.com>
Reviewed-on: http://review.coreboot.org/6766
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>