[Chore] Clean up pytorch helper functions in vllm.utils (#26908)

Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
Signed-off-by: isotr0py <2037008807@qq.com>

vllm/config/parallel.py

@@ -18,7 +18,8 @@ from vllm.model_executor.layers.batch_invariant import (
     vllm_is_batch_invariant,
 )
 from vllm.platforms import current_platform
-from vllm.utils import cuda_device_count_stateless, get_open_ports_list
+from vllm.utils import get_open_ports_list
+from vllm.utils.torch_utils import cuda_device_count_stateless
 
 if TYPE_CHECKING:
     from ray.runtime_env import RuntimeEnv