[SYCL] replace get_work_group_size() by local cache for performance

[NeoZhangJianyu]

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1. Use the cache in ggml_sycl_device_info() to replace function get_work_group_size() which has low performance.
2. Rm function get_work_group_size().

[airMeng]

Have you ran the UTs of norm and softmax on MTL/DG2?

[NeoZhangJianyu]

Have you ran the UTs of norm and softmax on MTL/DG2?

norm on Acr770 are passed.
softmax is not tested due to UT is broken by MUL_MAT with B16.

not test on MTL.