### What this PR does / why we need it?
Since the [PR](https://github.com/vllm-project/vllm/pull/28988) for PCP
modifications to `GPUModelRunner` has not yet been merged into vLLM,
this PR temporarily requires adjustments to certain buffer sizes. These
changes can be reverted once the original
[PR](https://github.com/vllm-project/vllm/pull/28988) is merged.
### Does this PR introduce _any_ user-facing change?
No
- vLLM version: v0.13.0
- vLLM main:
5326c89803
Signed-off-by: QiuChunshuo <qiuchunshuo@huawei.com>