opencl: fix kernel compilation for a6x GPUs (#30176)
* opencl: skip kernel_cpy_f32_f32_pack on A6X to avoid shader compiler crash
* The A6x compiler backend found in iot device with a623 (E031.50.31.01)
cannot handle kernels with a large number of arguments. Skip this
kernel for A6x to avoid compiler crash
* opencl: A6X constant-fold workaround for get_local_size in GEMV kernels
* opencl: add Adreno 623 to A6X GPU detection list
