zink: split out bind_sampler_states hook for drivers without EXT_non_seamless_cube_map

this incurs some overhead and is seldom used, so avoid having it in the codepath
at all if it won't be used

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18664>
1 file changed