[Bugfix][ROCm] Using device_type because on ROCm the API is still torch.cuda (#17601)

Signed-off-by: Gregory Shtrasberg <Gregory.Shtrasberg@amd.com>

vllm/platforms/interface.py

@@ -406,12 +406,12 @@ class Platform:
         """Raises if this request is unsupported on this platform"""
 
     def __getattr__(self, key: str):
-        device = getattr(torch, self.device_name, None)
+        device = getattr(torch, self.device_type, None)
         if device is not None and hasattr(device, key):
             return getattr(device, key)
         else:
             logger.warning("Current platform %s does not have '%s'" \
-            " attribute.", self.device_name, key)
+            " attribute.", self.device_type, key)
             return None
 
     @classmethod