configurations: santabarbara: add PDB2 MP5998 update config

Add PDB2 MP5998 config to get version and update firmware.

phosphor-dbus-interfaces entry:
[1] https://gerrit.openbmc.org/c/openbmc/phosphor-dbus-interfaces/+/83981/1/yaml/com/meta/Hardware/Santabarbara.interface.yaml#32

Tested on Santabarbara
```
$ curl -u root:0penBmc -k -H "Content-Type:multipart/form-data" -X POST https://$BMC_IP/redfish/v1/UpdateService/update-multipart -F UpdateParameters="{\"Targets\":[\"/redfish/v1/UpdateService/FirmwareInventory/Santabarbara_PDB2_HSC_p12v_aux_3849\"],\"@Redfish.OperationApplyTime\":\"OnReset\"};type=application/json" -F UpdateFile=@MP5998GQZ-001C-rev1_F0P-PDB_1-4_53h_508F_20250718.pldm;type=application/octet-stream
{
  "@odata.id": "/redfish/v1/TaskService/Tasks/1",
  "@odata.type": "#Task.v1_4_3.Task",
  "HidePayload": false,
  "Id": "1",
  "Messages": [
    {
      "@odata.type": "#Message.v1_1_1.Message",
      "Message": "The task with Id '1' has started.",
      "MessageArgs": [
        "1"
      ],
      "MessageId": "TaskEvent.1.0.TaskStarted",
      "MessageSeverity": "OK",
      "Resolution": "None."
    }
  ],
  "Name": "Task 1",
  "Payload": {
    "HttpHeaders": [],
    "HttpOperation": "POST",
    "TargetUri": "/redfish/v1/UpdateService/update-multipart"
  },
  "PercentComplete": 0,
  "StartTime": "2025-10-07T06:17:47+00:00",
  "TaskMonitor": "/redfish/v1/TaskService/TaskMonitors/1",
  "TaskState": "Running",
  "TaskStatus": "OK"
}

$ curl -u root:0penBmc -k -H "Content-Type:multipart/form-data" -X GET https://$BMC_IP/redfish/v1/TaskService/Tasks/1
{
  "@odata.id": "/redfish/v1/TaskService/Tasks/1",
  "@odata.type": "#Task.v1_4_3.Task",
  "EndTime": "2025-10-07T06:17:49+00:00",
  "HidePayload": false,
  "Id": "1",
  "Messages": [
    {
      "@odata.type": "#Message.v1_1_1.Message",
      "Message": "The task with Id '1' has started.",
      "MessageArgs": [
        "1"
      ],
      "MessageId": "TaskEvent.1.0.TaskStarted",
      "MessageSeverity": "OK",
      "Resolution": "None."
    },
    {
      "@odata.type": "#Message.v1_1_1.Message",
      "Message": "The task with Id '1' has changed to progress 100 percent complete.",
      "MessageArgs": [
        "1",
        "100"
      ],
      "MessageId": "TaskEvent.1.0.TaskProgressChanged",
      "MessageSeverity": "OK",
      "Resolution": "None."
    },
    {
      "@odata.type": "#Message.v1_1_1.Message",
      "Message": "The task with Id '1' has completed.",
      "MessageArgs": [
        "1"
      ],
      "MessageId": "TaskEvent.1.0.TaskCompletedOK",
      "MessageSeverity": "OK",
      "Resolution": "None."
    }
  ],
  "Name": "Task 1",
  "Payload": {
    "HttpHeaders": [],
    "HttpOperation": "POST",
    "JsonBody": "null",
    "TargetUri": "/redfish/v1/UpdateService/update-multipart"
  },
  "PercentComplete": 100,
  "StartTime": "2025-10-07T06:17:47+00:00",
  "TaskMonitor": "/redfish/v1/TaskService/TaskMonitors/1",
  "TaskState": "Completed",
  "TaskStatus": "OK"
}
```

Change-Id: If4670a617d86a7933e81763621d99880f0399192
Signed-off-by: Fred Chen <Fred.Chen@quantatw.com>
diff --git a/configurations/meta/santabarbara/santabarbara_pdb2.json b/configurations/meta/santabarbara/santabarbara_pdb2.json
index 0cde102..5082857 100644
--- a/configurations/meta/santabarbara/santabarbara_pdb2.json
+++ b/configurations/meta/santabarbara/santabarbara_pdb2.json
@@ -423,6 +423,16 @@
             "power1_Name": "PDB2_P12V_FAN3_PWR_W"
         },
         {
+            "Address": "0x53",
+            "Bus": 42,
+            "FirmwareInfo": {
+                "CompatibleHardware": "com.meta.Hardware.Santabarbara.VR.MP5998_p12v_aux",
+                "VendorIANA": 40981
+            },
+            "Name": "Santabarbara_PDB2_HSC_p12v_aux",
+            "Type": "MP5998Firmware"
+        },
+        {
             "Address": "0x4a",
             "Bus": 40,
             "Name": "PDB2_TOP_TEMP_C",