fix qwen2 model issue

vllm/model_executor/models/qwen2.py

@@ -46,7 +46,7 @@
 from vllm.model_executor.model_loader.weight_utils import (
     default_weight_loader, maybe_remap_kv_scale_name)
 from vllm.model_executor.sampling_metadata import SamplingMetadata
-from vllm.platform import current_platform
+from vllm.platforms import current_platform
 from vllm.sequence import IntermediateTensors
 
 from .interfaces import SupportsLoRA