[Qwen-moe] Remove the minor operation arange (#2373)

### What this PR does / why we need it?
Integrate the arange operator to reduce the time spent and improve
performance

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?

- vLLM version: v0.10.1.1
- vLLM main:
56dcf4e7e9

---------

Signed-off-by: s30076806 <songjiayang2@h-partners.com>

vllm_ascend/quantization/w4a8_dynamic.py

@@ -268,7 +268,7 @@ class AscendW4A8DynamicFusedMoEMethod:
             1] == global_num_experts, "Number of global experts mismatch"
 
         # NOTE: now npu_moe_gating_top_k can only support `group_count=256` pattern
-        topk_weights, topk_ids = select_experts(
+        topk_weights, topk_ids, row_idx = select_experts(
             hidden_states=x,
             router_logits=router_logits,
             top_k=top_k,
@@ -334,6 +334,7 @@ class AscendW4A8DynamicFusedMoEMethod:
                 w2_scale_bias=layer.w2_scale_bias,
                 topk_weights=topk_weights,
                 topk_ids=topk_ids,
+                row_idx=row_idx,
                 top_k=top_k,
                 expert_map=expert_map,
                 ep_group=self.ep_group,