[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/model_executor/models/config.py

@@ -6,7 +6,8 @@ from typing import TYPE_CHECKING
 import vllm.envs as envs
 from vllm.logger import init_logger
 from vllm.model_executor.models import ModelRegistry
-from vllm.utils import STR_DTYPE_TO_TORCH_DTYPE, cdiv, round_up
+from vllm.utils import cdiv, round_up
+from vllm.utils.torch_utils import STR_DTYPE_TO_TORCH_DTYPE
 from vllm.v1.kv_cache_interface import FullAttentionSpec, MambaSpec
 
 if TYPE_CHECKING: