ggml : remove old quantization functions (#5942)
* ggml : remove old quantization functions
ggml-ci
* ggml : simplify ggml_quantize_chunk
ggml-ci
* ggml : restrict correctness
ggml-ci
* ggml : remove hist data from the quantization API
ggml-ci
* tests : remove hist usage in test-backend-ops
ggml-ci
* vulkan : remove hist and fix typo