radv: call radv_nir_lower_ycbcr_textures after first optimizations

There might still be tex instructions with undef texture/sampler before
the first round of optimizations. No pipelinedb changes.

Fixes: 14a12b771d0a380defacafe5825362af77ff21bd ('spirv: Rework our handling of images and samplers')
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6083>
1 file changed