remove severity level for Blackout

Change-Id: I7c8717d4060b037c76ec44b4d02615c9dc749e49
Signed-off-by: Mike Capps <mikepcapps@gmail.com>
diff --git a/extensions/openpower-pels/registry/message_registry.json b/extensions/openpower-pels/registry/message_registry.json
index 19cf9e9..7d912bb 100644
--- a/extensions/openpower-pels/registry/message_registry.json
+++ b/extensions/openpower-pels/registry/message_registry.json
@@ -1537,7 +1537,6 @@
             "Name": "xyz.openbmc_project.State.Shutdown.Power.Error.Blackout",
             "Subsystem": "power",
             "ActionFlags": [ "report", "service_action" ],
-            "Severity": "unrecoverable",
             "ComponentID": "0x2700",
 
             "SRC":