ggml-cpu: add 128-bit impls for iq2_xs, iq3_s, iq3_xxs, tq2_0

Co-authored-by: Rehan Qasim <rehan.qasim@10xengineers.ai>

Author: RehanQasim-dev

ggml/src/ggml-cpu/arch-fallback.h

@@ -203,7 +203,6 @@
 // repack.cpp
 #define ggml_quantize_mat_q8_0_4x1_generic ggml_quantize_mat_q8_0_4x1
 #define ggml_quantize_mat_q8_0_4x4_generic ggml_quantize_mat_q8_0_4x4
-#define ggml_quantize_mat_q8_0_4x8_generic ggml_quantize_mat_q8_0_4x8
 #define ggml_quantize_mat_q8_K_4x1_generic ggml_quantize_mat_q8_K_4x1
 #define ggml_quantize_mat_q8_K_4x4_generic ggml_quantize_mat_q8_K_4x4
 #define ggml_quantize_mat_q8_K_4x8_generic ggml_quantize_mat_q8_K_4x8