ggml: aarch64: implement SVE kernels for q2_k_q8_k vector dot (#12064)
* Added SVE Support for Q2_K Quantized Models
* Use 4-space indentation in the switch cases
* removed comments lines
* Remove the loop Retain the curly bracess for better understanding of code
* Remove the comment like added for q3_k_q8_k kernel
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Co-authored-by: vithulep <p.m.vithule1517@gmail.com>