Adding attribute to turn memory early data on

Performance wants a way to turn memory early data on & off
using just scoms. Adding one attribute to control all the needed
scoms and defaulting everything so that early data is off.

For the L3 disable cp_me by default using scom

Changing the scom cp_me dial to disable cp_me for all systems
after Nimbus DD2.0. This is expected to be the correct setup
for most systems.

We didn't disable the cp_me at the scan, because the scom can
only disable cp_me if ON or allow the scan setting if set OFF. Some
systems might want cp_me enabled by only changing a scom. So the default
is to set cp_me on at the scan and off a the scom. This way only the
scom has to be turned off to enable cp_me.

Also update three scoms in the memory controler that are needed for
early data.

Change-Id: Id27ac44631cb0d29a30e295014a11ac43034954a
Original-Change-Id: Ib2106ec4b7d26cb084601f2d6eee68833b36d30b
CQ: HW426419
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/49261
Reviewed-by: Joseph J. McGill <jmcgill@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: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/55599
CI-Ready: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Tested-by: Daniel M. Crowell <dcrowell@us.ibm.com>

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

@@ -2399,6 +2399,23 @@
     </chipEcFeature>
   </attribute>
   <!-- ******************************************************************** -->
+  <attribute>
+    <id>ATTR_CHIP_EC_FEATURE_PRE_CACHE_DD21_SETTINGS</id>
+    <targetType>TARGET_TYPE_PROC_CHIP</targetType>
+    <description>
+      Not workaround or defect related. Just new dials to be set that are new in the caches for DD2.
+    </description>
+    <chipEcFeature>
+      <chip>
+        <name>ENUM_ATTR_NAME_NIMBUS</name>
+        <ec>
+          <value>0x20</value>
+          <test>LESS_THAN_OR_EQUAL</test>
+        </ec>
+      </chip>
+    </chipEcFeature>
+  </attribute>
+  <!-- ******************************************************************** -->
   <attribute>
     <id>ATTR_CHIP_EC_FEATURE_DISABLE_CP_ME</id>
     <targetType>TARGET_TYPE_PROC_CHIP</targetType>