[Intel GPU] DeepSeek V4 3/N: Support hc_split_sinkhorn on XPU using sgl_kernel (#27783)

Signed-off-by: P V R K Jyothendra Varma <polisetty.v.r.k.jyothendra.varma@intel.com>
Co-authored-by: Ma Mingfei <mingfei.ma@intel.com>

python/sglang/srt/models/deepseek_v4.py

@@ -68,7 +68,6 @@ from sglang.srt.layers.dp_attention import (
 from sglang.srt.layers.layernorm import RMSNorm
 from sglang.srt.layers.linear import ColumnParallelLinear, RowParallelLinear
 from sglang.srt.layers.logits_processor import LogitsProcessor
-from sglang.srt.layers.mhc import mhc_fused_post_pre, npu_hc_pre
 from sglang.srt.layers.moe import get_moe_a2a_backend, should_use_dp_reduce_scatterv
 from sglang.srt.layers.moe.fused_moe_triton import FusedMoE
 from sglang.srt.layers.quantization.fp8_kernel import sglang_per_token_group_quant_fp8
@@ -113,9 +112,12 @@ from sglang.srt.models.deepseek_common.amd.deepseek_v4_fused_mhc import (
     try_fused_hc_post_pre,
 )
 from sglang.srt.models.deepseek_common.utils import _use_aiter_bpreshuffle_gfx95
-from sglang.srt.models.deepseek_v2 import ParallelLMHead, _is_cuda, _is_hip, _is_npu
-from sglang.srt.models.triton_ops.deepseek_v4 import (
-    rms_normalize_triton as rms_normalize_triton,
+from sglang.srt.models.deepseek_v2 import (
+    ParallelLMHead,
+    _is_cuda,
+    _is_hip,
+    _is_npu,
+    _is_xpu,
 )
 from sglang.srt.runtime_context import get_parallel
 
@@ -124,6 +126,11 @@ if not _is_hip:
         prepare_context_parallel_metadata,
     )
 
+if _is_xpu:
+    from sgl_kernel import hc_split_sinkhorn
+else:
+    from sglang.srt.layers.mhc import hc_split_sinkhorn, mhc_fused_post_pre, npu_hc_pre
+
 from sglang.srt.server_args import get_global_server_args
 from sglang.srt.utils import (
     LazyValue,
@@ -1391,8 +1398,6 @@ class DeepseekV4DecoderLayer(nn.Module):
         else:
             x_flat, mixes = hc_pre_torch_impl(x, hc_fn)
 
-        from sglang.srt.layers.mhc import hc_split_sinkhorn
-
         pre, post, comb = hc_split_sinkhorn(
             mixes,
             hc_scale,