### What this PR does / why we need it? To prevent confusion between different QuantType classes, we remove** QuantType in prepare_finalize.py - vLLM version: v0.15.0 - vLLM main: https://github.com/vllm-project/vllm/commit/v0.15.0 Signed-off-by: shenchuxiaofugui <1311027364@qq.com>