ggml : riscv: add 128-bit RVV support (#12530)
* ggml : add 128-bit RVV support * ggml : revert to old RVV 256+ q2_K, q3_K, q4_K, q6_K impl * remove trailing whitespaces * restructure vector length selection code
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* ggml : add 128-bit RVV support * ggml : revert to old RVV 256+ q2_K, q3_K, q4_K, q6_K impl * remove trailing whitespaces * restructure vector length selection code