Fix PDA fails due to DRAM count on CDIMMs in p9c WR_VREF shmoo

Change-Id: Ie77a8ae405308e43ac13c6ea9299ad4deb90d8e0
CQ:SW440795
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/63804
Reviewed-by: STEPHEN GLANCY <sglancy@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: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: ANDRE A. MARIN <aamarin@us.ibm.com>
Dev-Ready: Louis Stermole <stermole@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/63837
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: Daniel M. Crowell <dcrowell@us.ibm.com>

src/import/chips/centaur/procedures/hwp/memory/lib/shared/dimmConsts.H

@@ -89,7 +89,8 @@ enum consts : size_t
     SP_ECC_BYTES_PER_PORT_ISDIMM = 1,
 
     MAX_DRAMS_PER_RANK_X8 = DATA_BYTES_PER_PORT + SP_ECC_BYTES_PER_PORT,
-    MAX_DRAMS_PER_RANK_X4 = MAX_DRAMS_PER_RANK_X8 * MAX_NIBBLES_PER_BYTE,
+    // Subtract one because CDIMM only has one spare DRAM
+    MAX_DRAMS_PER_RANK_X4 = MAX_DRAMS_PER_RANK_X8 * MAX_NIBBLES_PER_BYTE - 1,
     MAX_DRAMS_PER_RANK_X8_ISDIMM = DATA_BYTES_PER_PORT + SP_ECC_BYTES_PER_PORT_ISDIMM,
     MAX_DRAMS_PER_RANK_X4_ISDIMM = MAX_DRAMS_PER_RANK_X8_ISDIMM * MAX_NIBBLES_PER_BYTE,