radv/llvm: call nir_lower_io_to_vector with FS to fix array tests

Fixes dEQP-VK.glsl.440.linkage.varying.component.frag_out.*.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6883>
1 file changed