use byteorder.h instead of implementing another byte swap function

Change-Id: Id5fe7b597256ddf5d4ef408ec82cd94d84e7a0cd
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/277
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
1 file changed