k_quants tuning for Falcon-7b (#2816)
* Make ggml-cuda.cu build with QK_K = 64
Using LLAMA_CUDA_FORCE_DMMV = ON and -nommq it runs and produces
a meaningful result.
* k_quants tuning for Falcon-7b
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Co-authored-by: Iwan Kawrakow <iwan.kawrakow@gmail.com>
