[Feat][Graph] Support DeepSeek with ACL Graph (#2707)

### What this PR does / why we need it?
In memory of #677 , a long overdue milestone. Now DeepSeek V3/R1 should
be OK with ACL Graph.

### Does this PR introduce _any_ user-facing change?
None.

### How was this patch tested?
Working on it.

- vLLM version: v0.10.2
- vLLM main:
68dbde5dbb

---------

Signed-off-by: Yizhou Liu <liu_yizhou@outlook.com>

vllm_ascend/platform.py

@@ -227,8 +227,9 @@ class NPUPlatform(Platform):
                 "When enabling piecewise aclgraph, please make sure compilation_config.level == CompilationLevel.PIECEWISE and compilation_config.cudagraph_mode == CUDAGraphMode.PIECEWISE"
             compilation_config.set_splitting_ops_for_v1()
             compilation_config.use_inductor = False
-            compilation_config.splitting_ops.extend(
-                ["vllm.unified_ascend_attention_with_output"])
+            compilation_config.splitting_ops.extend([
+                "vllm.unified_ascend_attention_with_output", "vllm.mla_forward"
+            ])
             update_aclgraph_sizes(vllm_config)
         else:
             logger.info(