Delete redundant codes related to communication (#2717)

### What this PR does / why we need it?
Delete redundant codes related to communication

### Does this PR introduce _any_ user-facing change?
not involve

### How was this patch tested?
not involve

- vLLM version: v0.10.1.1
- vLLM main:
6c7af8110a

---------

Signed-off-by: 刘哲续 <liuzhexu1@huawei.com>
Co-authored-by: 刘哲续 <liuzhexu1@huawei.com>

vllm_ascend/ops/fused_moe.py

@@ -40,8 +40,6 @@ from vllm.model_executor.layers.quantization.base_config import \
 
 from vllm_ascend.ascend_config import get_ascend_config
 from vllm_ascend.ascend_forward_context import FusedMoEState
-from vllm_ascend.distributed.communication_op import \
-    data_parallel_reduce_scatter
 from vllm_ascend.distributed.parallel_state import get_mc2_group
 from vllm_ascend.ops.expert_load_balancer import ExpertLoadBalancer
 from vllm_ascend.ops.layers.experts_selector import select_experts
@@ -537,8 +535,8 @@ class AscendFusedMoE(FusedMoE):
                 final_hidden_states = final_hidden_states[start:end, :]
                 dispose_tensor(e_hidden_states)
             elif fused_moe_state == FusedMoEState.AllGather:
-                final_hidden_states = data_parallel_reduce_scatter(
-                    e_hidden_states, dim=0)
+                final_hidden_states = get_dp_group().reduce_scatter(
+                    e_hidden_states, 0)
                 final_hidden_states = final_hidden_states[:num_tokens]
                 dispose_tensor(e_hidden_states)
             else: