Enable redfish journal by default

The journal logs in redfish provide really useful information for
debugging. Enabling it by default for all system to use it.

Tested:
Redfish Validator Passed

Working example,
```
wget -qO- http://localhost:80/redfish/v1/Managers/bmc/LogServices/Journal
{
  "@odata.id": "/redfish/v1/Managers/bmc/LogServices/Journal",
  "@odata.type": "#LogService.v1_1_0.LogService",
  "DateTime": "1970-01-02T22:46:40+00:00",
  "DateTimeLocalOffset": "+00:00",
  "Description": "BMC Journal Log Service",
  "Entries": {
    "@odata.id": "/redfish/v1/Managers/bmc/LogServices/Journal/Entries"
  },
  "Id": "BMC Journal",
  "Name": "Open BMC Journal Log Service",
  "OverWritePolicy": "WrapsWhenFull"
}
```

```
{
  "@odata.id": "/redfish/v1/Managers/bmc/LogServices/Journal/Entries",
  "@odata.type": "#LogEntryCollection.LogEntryCollection",
  "Description": "Collection of BMC Journal Entries",
  "Members": [
    {
      "@odata.id": "/redfish/v1/Managers/bmc/LogServices/Journal/Entries/91187366227",
      "@odata.type": "#LogEntry.v1_8_0.LogEntry",
      "Created": "1970-01-02T01:19:47+00:00",
      "EntryType": "Oem",
      "Id": "91187366227",
      "Message": "bmcweb: (1970-01-02 01:19:47) [DEBUG \"memory.hpp\":438] Get available system components.",
      "Name": "BMC Journal Entry",
      "OemRecordFormat": "BMC Journal Entry",
      "Severity": "OK"
    },
    ...
}
```

Change-Id: I4f22e82884b28f76d7b505cca8b690132bc357b9
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/meson_options.txt b/meson_options.txt
index e731ab3..a32a4a4 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -78,7 +78,7 @@
 option(
     'redfish-bmc-journal',
     type: 'feature',
-    value: 'disabled',
+    value: 'enabled',
     description: '''Enable BMC journal access through Redfish. Paths are under
                     /redfish/v1/Managers/bmc/LogServices/Journal.'''
 )