Add the LPSS IOSF port access to reg_script. This is going to be used by baytrail. BUG=chrome-os-partner:23790 BRANCH=None TEST=Buit. Change-Id: I0367acdb584f2de0bb871b136042b57fe6b7ec90 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/176423 Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: http://review.coreboot.org/4968 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>