### What this PR does / why we need it?
support mxfp8 quantization (qwen liner layer)
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
- vLLM version: v0.13.0
- vLLM main:
2f4e6548ef
Signed-off-by: wangyao <iwangyao@outlook.com>