opencl: exclude some moe kernels on Adreno a7x (#25698)

• opencl: exclude Adreno A7x from using Adreno MoE kernels

Some compilers for A7x devices miscompile the repack kernels, corrupting the weights and causing MoE models to generate garbage output

• opencl: exclude A6x and unknown Adreno from MoE weights repack