The dunit on baytrail is the dram unit. Provide a means to access the configuration registers there using the proper IOSF mechanisms. BUG=chrome-os-partner:22875 BRANCH=none TEST=Built and booted. Able to read dram registers. Change-Id: I4d5c019720a7883fe93f3e1860bcd57ce2ea6542 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/170490 Reviewed-on: http://review.coreboot.org/4853 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>