[BugFix]Support redundant experts in EPLB (#3473)

This PR adds support for redundant experts in the EPLB. 

Key points: 
- Use global_num_experts = num_experts + num_redundant_experts
consistently.
- Backward compatible when num_redundant_experts=0. 

Tested 
On a 16-rank setup (W8A8) with static EPLB and expert_map_path,
verifying router logits shape and successful requests.

- vLLM version: v0.11.0rc3
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0

Signed-off-by: yechao237 <yechao20180411@gmail.com>

vllm_ascend/ops/moe/token_dispatcher.py

@@ -123,10 +123,7 @@ class TokenDispatcherWithMC2(MoETokenDispatcher):
     ):
         if self.with_quant:
             quant_mode = 2
-            if (expert_map is not None):
-                moe_expert_num = len(expert_map) + global_redundant_expert_num
-            else:
-                moe_expert_num = global_redundant_expert_num
+            moe_expert_num = len(expert_map)
         else:
             quant_mode = 0
             moe_expert_num = len(expert_map)