[SYCL] Prevent q_xxs using mul_mat_q

[AidanBeltonS]

There is currently a test failure for the A100 GPU which attempts to use mul_mat_q for q_xxs quantization. This quantization type is not supported in this approach, and results in an assert.

This change gets all expect one MUL_MAT test passing for the A100 GPU, it does not effect the ARC and PVC paths.
As the A100 has its min_compute_capability high enough to enable the use_mul_mat_q path.

[NeoZhangJianyu]

I think the code will effect the ARC and PVC paths.
min_compute_capability is fake value and not related to hardware type in fact.

What's the min_compute_capability value for A100 and Intel GPU? Maybe I'm wrong.

[AidanBeltonS]

I have found that it doesn't change the PVC path in my case. But even if it does, you do not want to run mul_mat_q with the Q_XXS quantization type as it will assert because it is unsupported. So this is a general behaviour that is needed for any hardware to be piped to the correct mul_mat.

[abhilash1910]

LGTM for the time being until q_xxs variants are properly supported.
Maybe rebasing would help with the CI?