meta-ampere: support Redfish event log

Enable system event log for Redfish. It includes the setting to:
 - Enable sel-logger module which logs the sensor event into the
systemd log.
 - Enable the rsyslog (intel module) to sync the sensor events from
systemd to /var/log/redfish. The file will be used by Redfish.
 - Configure the backend and redfish to get the system log from the
/var/log/redfish instead of system d-bus
 - Enable Redfish journal log

Tested: Verify event logs appear in:
1. Redfish: /redfish/v1/Systems/system/LogServices/EventLog/Entries
2. Redfish: /redfish/v1/Managers/bmc/LogServices/Journal/Entries
3. WebUI: /server-health/sys-log at Event type.

Signed-off-by: Thang Q. Nguyen <thang@os.amperecomputing.com>
Change-Id: I3753e2932ec1dc83cdbe0708173531930df65254
9 files changed