This romstage is minimalistic. Its goal is to set up some BARs that FSP expects to be set and then invoke FSP driver to train memory. Change-Id: I3fa56aafe99cf6cf062a46dece3a0febeafdbfad Signed-off-by: Andrey Petrov <andrey.petrov@intel.com> Reviewed-on: https://review.coreboot.org/13805 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>