Added MRS attributes and MRS data handling for Explorer

Change-Id: I7ace08351ee653d0db7d4a9a8a9aed990d0eaeb4
Original-Change-Id: Ia5db0e40c9d0f3bdcc590a7803471f7dc0fdcd77
git-coreq:hostboot:Ia5db0e40c9d0f3bdcc590a7803471f7dc0fdcd77
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/89850
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Dev-Ready: STEPHEN GLANCY <sglancy@us.ibm.com>
Reviewed-by: Mark Pizzutillo <mark.pizzutillo@ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Reviewed-by: Louis Stermole <stermole@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Jennifer A Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/95150
Reviewed-by: Daniel M Crowell <dcrowell@us.ibm.com>
Tested-by: Daniel M Crowell <dcrowell@us.ibm.com>