Revert ATTR_CEN_ECID back to ATTR_ECID

Firmware needs a common attribute for all chip targets

Change-Id: Ia448b73bed691f493c7edb98e675e6febce74d23
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/49941
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Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@us.ibm.com>
Reviewed-by: ANDRE A. MARIN <aamarin@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/49944
Reviewed-by: Hostboot Team <hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

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

@@ -271,11 +271,9 @@
 
 <attribute>
   <id>ATTR_ECID</id>
-  <targetType>TARGET_TYPE_PROC_CHIP</targetType>
+  <targetType>TARGET_TYPE_PROC_CHIP,TARGET_TYPE_MEMBUF_CHIP</targetType>
   <description>Bits 0 to 63 of the ECID in array entry 0 and bits 64 to 127 in ECID array entry 1
-  Created from running the mss_get_cen_ecid.C
-  Firmware shares some code with the processor,
-  so the attribute is named so they can point at a target and have common function.</description>
+  Populated by HWP called during IPL.</description>
   <valueType>uint64</valueType>
   <writeable/>
   <odmVisable/>