[Feat] Shared expert dp for deepseek and deepseek_mtp (#3495)

### What this PR does / why we need it?
shared expert dp for deepseek and deepseek_mtp, could be combined with
sp to improve performance.

### How was this patch tested?

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

---------

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

vllm_ascend/spec_decode/mtp_proposer.py

@@ -82,9 +82,7 @@ class MtpProposer(Proposer):
         with set_default_torch_dtype(
                 draft_model_config.dtype), set_current_vllm_config(
                     self.vllm_config):
-            if self.torchair_graph_enabled or (
-                    self.enable_shared_expert_dp
-                    and self.vllm_config.model_config.use_mla):
+            if self.torchair_graph_enabled:
                 self.model = TorchairDeepSeekMTP(
                     vllm_config=self.vllm_config).to(target_device)
             else: