### What this PR does / why we need it?
Register AscendMultiHeadLatentAttention as CustomOP, following vllm changes
### Does this PR introduce _any_ user-facing change?
N/A
### How was this patch tested?
CI passed with new added/existing test.
- vLLM version: main
- vLLM main:
b23fb78623
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Signed-off-by: Icey <1790571317@qq.com>