…w8a8 while main model uses w8a8
### What this PR does / why we need it?
Disable dispatch_gmm_combine_decode operator when mtp drafter model uses
non-w8a8 while main model uses w8a8, or drafter model is eagle series.
More info about this operator, please refer to RFC: issue
https://github.com/vllm-project/vllm-ascend/issues/5476
- vLLM version: release/v0.13.0
- vLLM main:
ad32e3e19c
Signed-off-by: wangqiankun <wangqiankun13@huawei.com>