ggml-cpu: aarm64: q4_K repack gemm and gemv implementations (dotprod only) (llama...

ggml-cpu: aarm64: q4_K repack gemm and gemv implementations (dotprod only) (llama/17494)

* Enabled q4_K_4x8 path

* Fixed generic Q4_K 8x4 implementation

* wip: dotprod gemm

* Working arm q4_K dotprod gemm

Signed-off-by: Alberto Cabrera <redacted>
* Undo acc rename

Signed-off-by: Alberto Cabrera <redacted>
* Q4_K arm dotprod gemm

Signed-off-by: Alberto Cabrera <redacted>
* Fix: q4_qs reinterpret from uint to int

Signed-off-by: Alberto Cabrera <redacted>
* Removed comments

* Fixed macro guards

* Fixed unused vars in generic implementation

* Fixed unused vars in 8x4 repack

* Fixed unused vars in generic implementation, unneeded comment

* Missing arch fallback for x86

* minor : style

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Signed-off-by: Alberto Cabrera <redacted>
Co-authored-by: Georgi Gerganov <redacted>