### What this PR does / why we need it?
This PR adds support for the optimized MLAPO operator in DSV3.2 and this
operator provides an optimized implementation that avoids redundant
q_down recomputation.
The operator implementation and optimizations were introduced in PR
[#4707](https://github.com/vllm-project/vllm-ascend/pull/4707).
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c
Signed-off-by: ZYang6263 <zy626375@gmail.com>
Co-authored-by: Yizhou Liu <liu_yizhou@outlook.com>