opencl: add q6_K gemm and gemv kernels for Adreno (llama/20089)

opencl: add q6_K gemm and gemv kernels for Adreno (llama/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