[Feature](ARD-2967) ard: add mqa score for spec decode for cape

Root Cause:
        add mqa score on gcu(currently only on xformers backend)
	vllm-project/vllm#9298
        some according to vllm-project/vllm#9291 vllm-project/vllm#12093
Solution:
        add it
Test:
        gcu
Impact area:
        vllm
Fix status:
        N/A

Change-Id: I977305ba636741090478bb4721b97f297d4aac6c

Author: chenjunzhou-enflame-tech