### What this PR does / why we need it?
This PR fix the bug in sfa-cp under multi-DP scenarios.
### Does this PR introduce _any_ user-facing change?
None
### How was this patch tested?
None
- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c
Signed-off-by: zzhxx <2783294813@qq.com>
Co-authored-by: clrs97 <524936896@qq.com>