PM:Remove deprecated attributes

RTC:173736
Change-Id: I49d8506f97f0fb61c1117fd57fe1fa302ad44b04
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/59837
Reviewed-by: Prem Shanker Jha <premjha2@in.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Gregory S. Still <stillgs@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/59841
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

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

@@ -48,20 +48,6 @@
     <platInit/>
   </attribute>
   <!-- ********************************************************************* -->
-  <attribute>
-    <id>ATTR_EXTERNAL_VRM_STEPDELAY</id>
-    <targetType>TARGET_TYPE_SYSTEM</targetType>
-    <description>
-    This attribute is deprecated and is not consumed.  See
-    ATTR_EXTERNAL_VRM_TRANSITION_START_NS,
-    ATTR_EXTERNAL_VRM_TRANSITION_RATE_INC_UV_PER_US,
-    ATTR_EXTERNAL_VRM_TRANSITION_RATE_DEC_UV_PER_US, and
-    ATTR_EXTERNAL_VRM_TRANSITION_STABILIZATION_TIME_NS
-    </description>
-    <valueType>uint32</valueType>
-    <platInit/>
-  </attribute>
-  <!-- ********************************************************************* -->
   <attribute>
     <id>ATTR_EXTERNAL_VRM_TRANSITION_START_NS</id>
     <targetType>TARGET_TYPE_SYSTEM</targetType>