PEL: Add phosphor-power NotSupported error

Add an entry to describe the NotSupported error from the phosphor-power
app. This error occurs when the power supply monitoring app detects that
the combination of power supplies in the system is not supported, such
as having mismatched models, or less than expected number of power
supplies.

Tested: Forced the power supply error and verified that the new SRC was
        created, journal output:
Apr 07 18:58:06 p10bmc phosphor-log-manager[285]: Created PEL 0x50000002
(BMC ID 2) with SRC 110015F7

        Error log:
$ curl -k -H "X-Auth-Token: $token" \
https://${bmc}/xyz/openbmc_project/logging/entry/2
...
    "Id": 2,
    "Message":
"xyz.openbmc_project.Power.PowerSupply.Error.NotSupported",
    "Path":
"/var/lib/phosphor-logging/extensions/pels/logs/2021040718580625_50000002",

Change-Id: I96d4d7fd91686761487bc56a019ea1e8f83da5cb
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/extensions/openpower-pels/registry/message_registry.json b/extensions/openpower-pels/registry/message_registry.json
index 3790167..fb79b99 100644
--- a/extensions/openpower-pels/registry/message_registry.json
+++ b/extensions/openpower-pels/registry/message_registry.json
@@ -841,6 +841,31 @@
         },
 
         {
+            "Name": "xyz.openbmc_project.Power.PowerSupply.Error.NotSupported",
+            "Subsystem": "power_supply",
+            "Severity": "unrecoverable",
+            "ActionFlags": ["service_action", "report", "call_home"],
+            "ComponentID": "0x2700",
+
+            "SRC": {
+                "Type": "11",
+                "ReasonCode": "0x15F7",
+                "Words6To9": {}
+            },
+
+            "Documentation": {
+                "Description": "Power Supply configuration is not supported",
+                "Message": "The power supply configuration is not supported",
+                "Notes": [
+                    "The combination of power supplies detected in the ",
+                    "system is not supported. This could be caused by ",
+                    "mismatched models, less than expected number of power ",
+                    "supplies, or other unsupported characteristics."
+                ]
+            }
+        },
+
+        {
             "Name": "xyz.openbmc_project.State.Shutdown.Power.Error.Blackout",
             "Subsystem": "power",
             "ActionFlags": [ "report", "service_action" ],