### What this PR does / why we need it?
Resolving the issue of insufficient resources during service operation
when PCP is enabled in a piecewise scenario.
When enabling PCP and executing in piecewise mode, the curl request
fails due to insufficient resources, resulting in the error message "The
resources are insufficient." Through profiling analysis, it was found
that the PCP communication domain also occupies streams and consumes
resources. Therefore, when updating aclgraph sizes, the PCP
communication domain needs to be taken into account.
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
- vLLM version: release/v0.13.0
- vLLM main:
bc0a5a0c08
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Signed-off-by: weiguihua2 <weiguihua2@huawei.com>
2b8a9ce8bd