nv50/ir/nir: fix ssbos and images

Fixes dEQP-GLES31.functional.image_load_store.* Fixes dEQP-GLES31.functional.ssbo.*

Fixes: f451854f ("nv50: add remapping of buffers/images into unified space") Signed-off-by: Karol Herbst kherbst@redhat.com

/cc @anholt /cc @imirkin