Add support for p9c 1.2

Also initial mk files for p9n 2.3, but p9c 1.2 will be first.

Change-Id: I543713b3ecdea728617f3c0cd97ddc6df0a92eae
Original-Change-Id: Ia73aba37be5bcf64b1b2cfe5b1ed153b189c7777
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/53909
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Joseph J. McGill <jmcgill@us.ibm.com>
Reviewed-by: James N. Klazynski <jklazyns@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/64780
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Tested-by: Daniel M. Crowell <dcrowell@us.ibm.com>