Add severity entry for voltage regulator failure

Regulator failure code has severity level upgraded to
critical_system_term. Primary purpose is to show correct codes on the
front panel.

Signed-off-by: Mike Capps <mikepcapps@gmail.com>
Change-Id: I29963be399d00f23b7b1941055d78031539dd248
diff --git a/extensions/openpower-pels/registry/message_registry.json b/extensions/openpower-pels/registry/message_registry.json
index 5b1471a..0fb39d6 100644
--- a/extensions/openpower-pels/registry/message_registry.json
+++ b/extensions/openpower-pels/registry/message_registry.json
@@ -1622,6 +1622,7 @@
         {
             "Name": "xyz.openbmc_project.State.Shutdown.Power.Error.Regulator",
             "Subsystem": "power_control_hw",
+            "Severity": "critical_system_term",
             "ComponentID": "0x2700",
 
             "SRC": {