[NIXL][HeteroTP] Enable KV transfer from HND prefill to NHD decode (#26556)

Signed-off-by: Chendi Xue <chendi.xue@intel.com>

vllm/config/kv_transfer.py

@@ -61,6 +61,9 @@ class KVTransferConfig:
     """The Python module path to dynamically load the KV connector from.
     Only supported in V1."""
 
+    enable_permute_local_kv: bool = False
+    """Experiment feature flag to enable HND to NHD KV Transfer"""
+
     def compute_hash(self) -> str:
         """
         WARNING: Whenever a new field is added to this config,