[chassis] Arista reboot cause service failing after conversion

[arlakshm]

We converted Arista 7808 from EOS to SONiC using the chassis_eos2sonic.py script. After conversion we see the arista reboot cause service is failing

admin@str3-7800-lc5-1:~$ systemctl list-units --state=failed
  UNIT                                 LOAD   ACTIVE SUB    DESCRIPTION
● platform-arista-reboot-cause.service loaded failed failed Arista reboot cause processing

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.
1 loaded units listed.
admin@str3-7800-lc5-1:~$ sudo systemctl status platform-arista-reboot-cause.service
× platform-arista-reboot-cause.service - Arista reboot cause processing
     Loaded: loaded (/lib/systemd/system/platform-arista-reboot-cause.service; enabled; preset: enabled)
     Active: failed (Result: exit-code) since Wed 2024-12-11 01:36:36 UTC; 12min ago
   Main PID: 1291 (code=exited, status=1/FAILURE)

Dec 11 01:36:36 sonic arista[1291]:            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 01:36:36 sonic arista[1291]:   File "/usr/lib/python3/dist-packages/arista/utils/rpc/client.py", line 118, in _doGetCommandResponse
Dec 11 01:36:36 sonic arista[1291]:     return self._processResponse(responseStr, uid)
Dec 11 01:36:36 sonic arista[1291]:            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 01:36:36 sonic arista[1291]:   File "/usr/lib/python3/dist-packages/arista/utils/rpc/client.py", line 105, in _processResponse
Dec 11 01:36:36 sonic arista[1291]:     raise RpcServerException(response['error'])
Dec 11 01:36:36 sonic arista[1291]: arista.utils.rpc.client.RpcServerException: {'code': -1, 'message': 'Storing reboot cause without loading them first'}
Dec 11 01:36:36 sonic systemd[1]: platform-arista-reboot-cause.service: Main process exited, code=exited, status=1/FAILURE
Dec 11 01:36:36 sonic systemd[1]: platform-arista-reboot-cause.service: Failed with result 'exit-code'.
Dec 11 01:36:36 sonic systemd[1]: Failed to start platform-arista-reboot-cause.service - Arista reboot cause processing.

[arlakshm]

@patrickmacarthur for viz..