ggml : remove assert for AArch64 GEMV and GEMM Q4 kernels (ggml-org#9217)

* ggml : remove assert for AArch64 GEMV and GEMM Q4 kernels

* added fallback mechanism when the offline re-quantized model is not
optimized for the underlying target.

* fix for build errors

* remove prints from the low-level code

* Rebase to the latest upstream

Author: chaxu01