opencl: add q6_K gemm and gemv kernels for Adreno (#20089)
* opencl: add q6_K noshuffle kernels, initial q6_K gemv, some host code
* opencl: add q6_K transpose
* opencl: fix cvt kernel name
* opencl: add call to q6_K gemv
* opencl: fix q6_K scale transpose
* opencl: fix loading for gemv q6_K, refactor
* opencl: fix transpose_8_buf kernel assignment, refactor
* opencl: refactor q6_K transpose
* opencl: add gemm_noshuffle_q6_k_f32
* opencl: fix qh loading
* opencl: refactor q6_K gemv host side, release bufs and imgs
* opencl: refactor
* opencl: fix q6_K dequant and scale selection
* opencl: workaround compiler bug, fix dump_tensor
* opencl: refactor q6_K convert kernels
* opencl: unpack transformed q6_K in get_tensor
* opencl: refactor, handle non-uniform workgroups
* opencl: support non-vector subgroup bcast
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