[Chore] Separate out vllm.utils.importlib (#27022)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/platforms/__init__.py

@@ -7,7 +7,8 @@ from typing import TYPE_CHECKING
 
 from vllm import envs
 from vllm.plugins import PLATFORM_PLUGINS_GROUP, load_plugins_by_group
-from vllm.utils import resolve_obj_by_qualname, supports_xccl
+from vllm.utils import supports_xccl
+from vllm.utils.import_utils import resolve_obj_by_qualname
 
 from .interface import CpuArchEnum, Platform, PlatformEnum