fix: use DeepEPDispatcher on CUDA (#5180)

python/sglang/srt/models/deepseek_v2.py

@@ -50,7 +50,6 @@ from sglang.srt.layers.linear import (
 )
 from sglang.srt.layers.logits_processor import LogitsProcessor
 from sglang.srt.layers.moe.ep_moe.layer import DeepEPMoE, EPMoE
-from sglang.srt.layers.moe.ep_moe.token_dispatcher import DeepEPDispatcher
 from sglang.srt.layers.moe.fused_moe_triton import FusedMoE
 from sglang.srt.layers.moe.topk import select_experts
 from sglang.srt.layers.quantization.base_config import QuantizationConfig
@@ -79,6 +78,8 @@ _is_cuda = is_cuda()
 
 if _is_cuda:
     from sgl_kernel import awq_dequantize, bmm_fp8
+
+    from sglang.srt.layers.moe.ep_moe.token_dispatcher import DeepEPDispatcher
 else:
     from vllm import _custom_ops as ops