b4876

CUDA/HIP: Fix fattn-vec-* when device warp size is not 32 (#12315)

When fattn-wmma was ported over to warp64 various bits that also touch fattn-vec where converted to
selectable warp size, however the fattn-vec kernels dont work with 64 wide warps for now, so we need
to avoid launching them with parameters for warp64