ggml: optimize some vec dot functions for LoongArch ASX (#11842)
* Optimize ggml_vec_dot_q3_K_q8_K for LoongArch ASX
* Optimize ggml_vec_dot_q4_K_q8_K for LoongArch ASX
* Optimize ggml_vec_dot_q6_K_q8_K for LoongArch ASX
* Optimize ggml_vec_dot_q5_K_q8_K for LoongArch ASX
* Optimize ggml_vec_dot_q2_K_q8_K for LoongArch ASX
* Optimize mul_sum_i8_pairs_float for LoongArch ASX
* Optimize ggml_vec_dot_iq4_xs_q8_K for LoongArch ASX