[FEATURE][MTP] Support MTP > 1 (#2708)

### What this PR does / why we need it?
[RFC：Support MTP > 1 for
DeepSeek](https://github.com/vllm-project/vllm-ascend/issues/2745)

- [x] dp1 tp16
- [x] dp4 tp4
- [x] dp2 tp 8
- [x] torchair graph

- vLLM version: v0.10.1.1
- vLLM main:
c9f7081f9c

Signed-off-by: 1092626063 <1092626063@qq.com>

vllm_ascend/torchair/torchair_mla.py

@@ -1020,7 +1020,6 @@ class AscendMLATorchairImpl(MLAAttentionImpl):
                 input_layout = "BNSD"
 
             if attn_metadata.attn_state == AscendAttentionState.SpecDecoding:
-                assert num_tokens % self.spec_token_num == 0
                 input_layout = "TND"
                 # [bs * q_seq_len, num_heads_per_rank, dim]
                 q_nope = q_nope.view(num_tokens, self.num_heads, -1)