Newer versions of IASL didn't like our IO constructs. Use
FixedIO instead, it's also shorter.
Change-Id: I9364d993ecb71ffd84c0313ca1e2f870af59eb24
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/934
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>