[Hardware][ROCM] using current_platform.is_rocm (#9642)

Signed-off-by: wangshuai09 <391746016@qq.com>

vllm/utils.py

@@ -314,10 +314,6 @@ class PyObjectCache:
         self._index = 0
 
 
-def is_hip() -> bool:
-    return torch.version.hip is not None
-
-
 @lru_cache(maxsize=None)
 def get_max_shared_memory_bytes(gpu: int = 0) -> int:
     """Returns the maximum shared memory per thread block in bytes."""
@@ -1098,7 +1094,7 @@ def _cuda_device_count_stateless(
 
     if not torch.cuda._is_compiled():
         return 0
-    if is_hip():
+    if current_platform.is_rocm():
         # ROCm uses amdsmi instead of nvml for stateless device count
         # This requires a sufficiently modern version of Torch 2.4.0
         raw_count = torch.cuda._device_count_amdsmi() if (hasattr(