[Feat] Flash comm allgher ep (#3334)

Support flash comm v1(Sequence Parallelism) for Allgather EP.

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

---------

Signed-off-by: realliujiaxu <realliujiaxu@163.com>
Co-authored-by: zhaozx-cn <zhaozx2116@163.com>

vllm_ascend/models/deepseek_v2.py

@@ -300,12 +300,11 @@ class CustomDeepseekV2MLAAttention(DeepseekV2MLAAttention):
             bias=False,
             quant_config=quant_config,
             prefix=f"{prefix}.kv_b_proj")
-        self.o_proj = CustomDeepseekV2RowParallelLinear(
-            self.num_heads * self.v_head_dim,
-            self.hidden_size,
-            bias=False,
-            quant_config=quant_config,
-            prefix=f"{prefix}.o_proj")
+        self.o_proj = RowParallelLinear(self.num_heads * self.v_head_dim,
+                                        self.hidden_size,
+                                        bias=False,
+                                        quant_config=quant_config,
+                                        prefix=f"{prefix}.o_proj")
 
         if rope_scaling:
             rope_scaling["rope_type"] = 'deepseek_yarn'