[XPU][CPU] Enable the native path of DeepSeek (#4086)

Co-authored-by: Zhang, Liangang <liangang.zhang@intel.com>

python/sglang/srt/model_executor/model_runner.py

@@ -35,6 +35,8 @@ from sglang.srt.distributed import (
     set_custom_all_reduce,
 )
 from sglang.srt.distributed.parallel_state import monkey_patch_vllm_parallel_state
+from sglang.srt.layers.attention.double_sparsity_backend import DoubleSparseAttnBackend
+from sglang.srt.layers.attention.torch_native_backend import TorchNativeAttnBackend
 from sglang.srt.layers.dp_attention import (
     get_attention_tp_group,
     get_attention_tp_size,