Build-time specification of correct SGX Core for ctp_pr1 variant, KM.

Build-time specification of correct SGX Core for ctp_pr1 variant, KM.

BZ: 26839

Change-Id: I081a96cce389fdc94588e6215917ae700498ac39
Signed-off-by: Dale Stimson <dalex.b.stimson@intel.com>
Reviewed-on: http://android.intel.com:8080/39163
Reviewed-by: Ponnusamy, Siva Prasath <siva.prasath.ponnusamy@intel.com>
Reviewed-by: Dai, Yu <yu.dai@intel.com>
Reviewed-by: Xu, Randy <randy.xu@intel.com>
Tested-by: Xu, Randy <randy.xu@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>