[Bugfix] No num_gpus for ROCm and XPU when connecting to a ray cluster

[HollowMan6]

I don't find any reason for making a special case for ROCm and XPU, as they should make no difference with CUDA or something else in this case.

Error log:

  File "vllm/vllm/engine/llm_engine.py", line 528, in _get_executor_cls
    initialize_ray_cluster(engine_config.parallel_config)
  File "vllm/vllm/executor/ray_utils.py", line 230, in initialize_ray_cluster
    ray.init(address=ray_address,
  File "venv/lib/python3.11/site-packages/ray/_private/client_mode_hook.py",
   line 103, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "venv/lib/python3.11/site-packages/ray/_private/worker.py",
   line 1689, in init
    raise ValueError(
ValueError: When connecting to an existing cluster, num_cpus and num_gpus must not be provided.

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[HollowMan6]

Closing as a similar fix has already been merged #9439