meta-facebook: bletchley: Fix BMC state stuck in 'NotReady'

We observed that the BMC state remains in the 'NotReady' state, with
systemctl list-jobs showing chassis-poweron@X.service stuck in a running
state.

The issue is from the `ExecStartPost` in `chassis-poweron@.service`,
which attempts to start `phosphor-discover-system-state` and waits for
it to complete. However, `phosphor-discover-system-state` only starts
after `multi-user.target` is done, creating a circular dependency that
prevents proper initialization.

Removed the `ExecStartPost` from `chassis-poweron@.service`. Moved the
`power-ctrl sledX ac-on` and `phosphor-discover-system-state@X.service`
execution into a dedicated `chassis-poweron` script.

This approach ensures proper sequencing and prevents the circular
waiting condition, allowing the system to reach a 'Ready' state as
expected.

Test Results:
BMC success and get into Ready state, and no jobs remain.
```
root@bmc:~# systemctl list-jobs
No jobs running.
root@bmc:~# obmcutil bmcstate
CurrentBMCState     : xyz.openbmc_project.State.BMC.BMCState.Ready
```

Change-Id: I75ef6d3f42eb826d952e0a2572d133d665fc14e4
Signed-off-by: Potin Lai <potin.lai@quantatw.com>

0 files changed, 0 insertions, 0 deletions