Revert "intel/isl: Don't reconfigure aux surfaces for MCS"

This reverts commit 2f0fbe06e6.

We don't handle the reconfiguration of existing HiZ surfaces, nor do we
do so for CCS surfaces. This code path is unused, so we remove it.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14464>

src/intel/isl/isl.c

@@ -2057,9 +2057,6 @@ isl_surf_get_mcs_surf(const struct isl_device *dev,
    if (surf->msaa_layout != ISL_MSAA_LAYOUT_ARRAY)
       return false;
 
-   if (mcs_surf->size_B > 0)
-      return false;
-
    /* The following are true of all multisampled surfaces */
    assert(surf->samples > 1);
    assert(surf->dim == ISL_SURF_DIM_2D);