support --no-enable-chunked-prefill for V1

Author: luna

vllm/engine/arg_utils.py

@@ -1545,7 +1545,8 @@ def _set_default_args_v1(self, usage_context: UsageContext,
         # for non-pooling tasks.
         # For pooling tasks the default is False
         if model_config.runner_type != "pooling":
-            self.enable_chunked_prefill = True
+            if self.enable_chunked_prefill is None:
+                self.enable_chunked_prefill = True
             if self.enable_prefix_caching is None:
                 self.enable_prefix_caching = True
         else: