sycl: add Q2_K to DMMV reorder path

[malsbat]

Overview

Add Q2_K to DMMV reorder path.

Additional information

The measured results are on top of #25063.

export GGML_SYCL_PRIORITIZE_DMMV=1
./build/bin/llama-bench -p 64 -n 16 -r 1 -ngl 999 -dev SYCL0 -m /models/Qwen3.5-27B-Q2.gguf

model	test	baseline t/s	KQPI=1 t/s	KQPI=1 reordered t/s
qwen35 27B Q2_K - Medium	pp64	155.74 ± 0.00	157.79 ± 0.00	160.27 ± 0.00	1.028
qwen35 27B Q2_K - Medium	tg16	14.60 ± 0.00	11.34 ± 0.00	18.31 ± 0.00	1.254

Requirements

• I have read and agree with the contributing guidelines
• AI usage disclosure: YES, used to author the new functions based on the existing reorder paths.

[arthw]

It's good job!
It could increase the perf on LLM Qwen3.5-27B-UD-Q2_K_XL.gguf.

Will you change it from draft to open status?
Or have you any plan to update this PR later?

Thank you!