[BUGFIX] main-sd-bugfix && [UT] add mtp UT (#593)

### What this PR does / why we need it?
The pr will fix some bug about spec decode / MTP
The pr add a mtp e2e UT `test_mtp_correctness.py`

**vllm_ascend/attention/attention.py**
1. add support `self.attn_mask_cache` only has 1 element to cover scene
in which both spec docode and chunked prefill are enabled.

**vllm_ascend/distributed/parallel_state.py**
1. remove 2 assert because spec decode worker would use init_worker
twice

**vllm_ascend/models/deepseek_mtp.py**
1. remove unused params;
2. add support w8a8 in `CustomDeepSeekMTP`

**vllm_ascend/quantization/quant_config.py**
1. use `AscendUnquantizedFusedMoEMethod` instead of
`UnquantizedFusedMoEMethod`

**other**
1. replace `from vllm.logger import init_logger` to `from vllm.logger
import logger` all of the vllm-ascend project



### Does this PR introduce _any_ user-facing change?


### How was this patch tested?

Signed-off-by: mengwei805 <mengwei25@huawei.com>

vllm_ascend/distributed/parallel_state.py

@@ -36,7 +36,6 @@ def init_ascend_model_parallel(
                                               expert_tensor_parallel_size)
 
     global _EP
-    assert _EP is None, ("expert parallel group is already initialized")
     group_ranks = []
     for i in range(num_expert_parallel_groups):
         ranks = list(range(i, world_size, num_expert_parallel_groups))
@@ -49,8 +48,6 @@ def init_ascend_model_parallel(
 
     group_ranks = []
     global _ETP
-    assert _ETP is None, (
-        "expert tensor parallel group is already initialized")
     for i in range(num_expert_tensor_parallel_groups):
         ranks = list(
             range(i * expert_tensor_parallel_size,