Implement MRW attributes; dram_clks, db_util, 2n_mode

  ATTR_MSS_MRW_MEM_M_DRAM_CLOCKS
  ATTR_MSS_MRW_MAX_DRAM_DATABUS_UTIL
  ATTR_MSS_MRW_DRAM_2N_MODE

  TSYS_ADR, TSYS_DATA moved the MT VPD
  GPO, RLO, WLO moved to the MT VPD

  Update hb defaults
  Update unit test to catch the 2N mode MRW changes

Change-Id: I3d998c70d30df978062ce923096ba741d597782e
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/28383
Dev-Ready: Brian R. Silver <bsilver@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Matt K. Light <mklight@us.ibm.com>
Reviewed-by: Louis Stermole <stermole@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: ANDRE A. MARIN <aamarin@us.ibm.com>
Reviewed-by: JACOB L. HARVEY <jlharvey@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/69778
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>
Tested-by: Sachin Gupta <sgupta2m@in.ibm.com>

src/import/chips/p9/procedures/xml/attribute_info/memory_mcs_attributes.xml

@@ -2120,21 +2120,6 @@
         <mssAccessorName>vmem_regulator_max_dimm_count</mssAccessorName>
     </attribute>
 
-    <attribute>
-        <id>ATTR_MSS_DATABUS_UTIL</id>
-        <targetType>TARGET_TYPE_MCS</targetType>
-        <!-- TK Do we need an attr per port & dimm ? P8 only had an attr per port AAM -->
-        <!-- TK Does OCC set this for their use, if so, name attr appropriately? AAM  -->
-        <description>
-          DRAM data bus utilization percent to use to determine cfg_nm_n_per_port
-        </description>
-        <initToZero></initToZero>
-        <valueType>uint8</valueType>
-        <writeable/>
-        <array>2</array>
-        <mssAccessorName>databus_util</mssAccessorName>
-    </attribute>
-
     <attribute>
       <id>ATTR_MSS_OCC_THROTTLED_N_CMDS</id>
       <targetType>TARGET_TYPE_MCS</targetType>