[Misc] Fix circular import in vllm.transformers_utils.config (#30179)

Signed-off-by: Ye (Charlotte) Qi <yeq@meta.com>

vllm/transformers_utils/config.py

@@ -25,7 +25,6 @@ from transformers.models.auto.tokenization_auto import get_tokenizer_config
 from transformers.utils import CONFIG_NAME as HF_CONFIG_NAME
 
 from vllm import envs
-from vllm.config.utils import getattr_iter
 from vllm.logger import init_logger
 from vllm.transformers_utils.utils import parse_safetensors_file_metadata
 
@@ -305,6 +304,8 @@ def set_default_rope_theta(config: PretrainedConfig, default_theta: float) -> No
 
 def patch_rope_parameters(config: PretrainedConfig) -> None:
     """Provide backwards compatibility for RoPE."""
+    from vllm.config.utils import getattr_iter
+
     rope_theta_names = ("rope_theta", "rotary_emb_base")
     rope_theta = getattr_iter(config, rope_theta_names, None)
     if Version(version("transformers")) < Version("5.0.0.dev0"):