Increment red_waterfall for low vdn fix

Change-Id: Iaa5dbf94fe223cdfef7ebbfe8598f98f5472c956
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/46420
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Dev-Ready: JACOB L. HARVEY <jlharvey@us.ibm.com>
Reviewed-by: Louis Stermole <stermole@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Matt K. Light <mklight@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/46453
Reviewed-by: Hostboot Team <hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

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

@@ -4601,6 +4601,24 @@
     </chipEcFeature>
   </attribute>
 
+  <attribute>
+    <id>ATTR_CHIP_EC_FEATURE_MSS_RED_WATERFALL_ADJUST</id>
+    <targetType>TARGET_TYPE_PROC_CHIP</targetType>
+    <description>
+        In DD2.** Nimbus, We adjust the red waterfall to account for low VDN settings.
+        We move the waterfall forward by one
+    </description>
+    <chipEcFeature>
+      <chip>
+        <name>ENUM_ATTR_NAME_NIMBUS</name>
+        <ec>
+          <value>0x20</value>
+          <test>GREATER_THAN_OR_EQUAL</test>
+        </ec>
+      </chip>
+    </chipEcFeature>
+  </attribute>
+
   <attribute>
     <id>ATTR_CHIP_EC_FEATURE_MSS_CHECK_DIABLE_RD_VREF_CAL_VREFSENSE</id>
     <targetType>TARGET_TYPE_PROC_CHIP</targetType>
@@ -4860,7 +4878,7 @@
       </chip>
     </chipEcFeature>
   </attribute>
-  
+
   <attribute>
     <id>ATTR_CHIP_EC_FEATURE_HW413362_P9UDD11_ASYNC</id>
     <targetType>TARGET_TYPE_PROC_CHIP</targetType>