zink: expose depth-clip if supported

We already set up the state as needed, so it should only be a matter of
exposing it.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5495>

src/gallium/drivers/zink/zink_screen.c

@@ -148,10 +148,8 @@ zink_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
       return screen->props.limits.maxImageArrayLayers;
 
-#if 0 /* TODO: Enable me */
    case PIPE_CAP_DEPTH_CLIP_DISABLE:
-      return 0;
-#endif
+      return screen->feats.depthClamp;
 
    case PIPE_CAP_TGSI_INSTANCEID:
    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS: