Use preferred style of fixed-width integer types

Use preferred style of fixed-width integer types

Change-Id: I1abaaa2af4de940584039f9b8c348bb57fb611e0
Signed-off-by: Jonathan A. Kollasch <jakllsch@kollasch.net>
Reviewed-on: http://review.coreboot.org/125
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Peter Stuge <peter@stuge.se>