Re-enable training advanced WR_VREF algorithm in xml for p9c

Change-Id: I7810246c4ff121ba619ce2635cfb916673522097
CQ:SW443239
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/65017
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@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>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/65030
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>

src/import/chips/centaur/procedures/xml/attribute_info/memory_attributes.xml

@@ -114,11 +114,11 @@ Set by: PLL settings written by Dave Cadigan</description>
 <id>ATTR_CEN_MSS_VREF_CAL_CNTL</id>
     <targetType>TARGET_TYPE_MEMBUF_CHIP</targetType>
     <description>Training Control over IPL - ENUM - 0x00=DISABLE /Skip V-ref Train; 0x01=P8_DRAM - Enable V-Ref Train DRAM Level (P8 algorithm); 0x02=P8_RANK Level Training (P8 algorithm); 0x03=Box shmoo; 0x04=Ternary shmoo
-         Default Value = 0x00 for disabling training advanced on all platforms
+         Default Value = 0x04 for WR_VREF training on all platforms
 </description>
     <valueType>uint8</valueType>
     <enum>DISABLE = 0, P8_DRAM = 1, P8_RANK = 2, BOX = 3, TERNARY = 4</enum>
-    <default>DISABLE</default>
+    <default>TERNARY</default>
     <platInit/>
     <mrwHide/>
 </attribute>