Revert "[Feat] Shared expert dp for deepseek and deepseek_mtp (#3495)" (#3586)

### What this PR does / why we need it?
This reverts commit
bf87606932.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
E2E vllm serving with `enable_shared_expert_dp: true` in eager mode as
before.


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

Signed-off-by: linfeng-yuan <1102311262@qq.com>

vllm_ascend/attention/mla_v1.py

@@ -1278,8 +1278,7 @@ class AscendMLAImpl(MLAAttentionImpl):
             current_ms_metadata = get_multistream_comm_context()
             if current_ms_metadata is not None:
                 with torch.npu.stream(current_ms_metadata.comm_stream):
-                    o_proj_input[
-                        num_decode_tokens:num_actual_tokens] = output_prefill
+                    o_proj_input[num_decode_tokens:] = output_prefill
                     current_ms_metadata.after_comm_event.record()
             else:
                 o_proj_input[