Add FAPI_POS and account for 4 possible PMIC targets

Forgot to add FAPI_POS with original PMIC target commit.
New DIMMs will support 4 PMIC targets, so update
simics_AXONE based on that information.

Change-Id: I36b966ce7b57f0c1d7124893c5d487f34797b9d7
RTC: 206184
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/76173
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Reviewed-by: Glenn Miles <milesg@ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>