chestnut: model fails to load with remote start

### Describe the bug

When using remote start on a Hyundai Sonata, the cigarette lighter power outlet remains off. As a result, the gpu doesn't receive power, causing the model loading process to time out and fail.

> [!IMPORTANT]
> will reproduce using stock model soon
```
Traceback (most recent call last):
File "/data/openpilot/openpilot/sunnypilot/modeld_v2/modeld.py", line 557, in
main(demo=args.demo)
File "/data/openpilot/openpilot/sunnypilot/modeld_v2/modeld.py", line 375, in main
raise RuntimeError("eGPU model load failed or timed out (60s)")
RuntimeError: eGPU model load failed or timed out (60s)
```

### Provide a route where the issue occurs

d59ca223dca8da93

### openpilot version

master

Start with sunnypilot/modeld_v2/modeld.py, especially main() and the eGPU model-load timeout shown in the traceback. Reproduce remote start on a Hyundai Sonata using route d59ca223dca8da93 and the stock model when available; done means the GPU receives power and the model loads without the 60-second timeout.

Written by the indexing model from the issue text.