### What this PR does / why we need it?
This PR aims to fix unsuitable `moe_comm_type` under `ep=1` scenario.
The related issue #5375 have reported that `ep=1` can cause errors in
local environment, but those cases work well on ci. The point is the
difference between machines and `moe_comm_type` may not be chosen
correctly.
### Does this PR introduce _any_ user-facing change?
N/A
### How was this patch tested?
by ci
- vLLM version: release/v0.13.0
- vLLM main:
bc0a5a0c08
Signed-off-by: Zetong Li <slippersss@126.com>
Co-authored-by: weijinqian0 <1184188277@qq.com>