st/mesa: revalidate image atoms when a texture is updated

st/mesa: revalidate image atoms when a texture is updated

A texture may be redefined with _NEW_TEXTURE, which might have been
bound to a shader image slot. We have to revalidate the image atoms to
pick up on the new resource.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>