PEL: Add error message registry entry for devtree backup

Adding error entry in the message registry JSON file for
devtree backup failure . During the code update need to
save backup copy of phal devtree r/w attributes and update
to new device tree file in the reboot path.
This error entry indicates the failure during this data backup.

Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: I8fb6c8dcb190428efcc6a0c30f450d809103d773
diff --git a/extensions/openpower-pels/registry/message_registry.json b/extensions/openpower-pels/registry/message_registry.json
index f8e2ebf..3790167 100644
--- a/extensions/openpower-pels/registry/message_registry.json
+++ b/extensions/openpower-pels/registry/message_registry.json
@@ -448,6 +448,30 @@
         },
 
         {
+            "Name": "org.open_power.PHAL.Error.devtreeBackup",
+            "Subsystem": "cec_hardware",
+            "ComponentID": "0x3000",
+            "Severity": "unrecoverable",
+
+            "SRC":
+            {
+                "ReasonCode": "0x3004",
+                "Words6To9":
+                {
+                }
+            },
+
+            "Documentation":
+            {
+                "Description": "Failure occurred during PHAL devtree backup ",
+                "Message": "Failure occurred during PHAL devtree backup",
+                "Notes": [
+                    "The journal should contain more information"
+                ]
+            }
+        },
+
+        {
             "Name": "org.open_power.Processor.Error.SbeChipOpFailure",
             "Subsystem": "processor_chip",
             "ComponentID": "0x3500",