crocus/gen6: fix depth blit blorp regression.

The tesseract fix broke depth blits using blorp as depth blits
on gen6 are done using the color engine. Just disable aux
up front on the destination for this case.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11456>

src/gallium/drivers/crocus/crocus_blit.c

@@ -568,12 +568,18 @@ use_blorp:
       //      crocus_emit_buffer_barrier_for(batch, src_res->bo,
       //                                   CROCUS_DOMAIN_OTHER_READ);
 
+      bool dst_aux_disable = false;
+      /* on SNB blorp will use render target instead of depth
+       * so disable HiZ.
+       */
+      if (devinfo->ver <= 6 && util_format_is_depth_or_stencil(dst_pfmt))
+         dst_aux_disable = true;
       struct crocus_format_info dst_fmt =
          crocus_format_for_usage(devinfo, dst_pfmt,
                                  ISL_SURF_USAGE_RENDER_TARGET_BIT);
       enum isl_aux_usage dst_aux_usage =
          crocus_resource_render_aux_usage(ice, dst_res, info->dst.level,
-                                          dst_fmt.fmt, false);
+                                          dst_fmt.fmt, dst_aux_disable);
 
       struct blorp_surf src_surf, dst_surf;
       crocus_blorp_surf_for_resource(&screen->vtbl, &screen->isl_dev, &src_surf,