intel/dev/common: Add xe2 support to get_l3_list()

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26742>

src/intel/common/intel_l3_config.c

@@ -200,6 +200,9 @@ get_l3_list(const struct intel_device_info *devinfo)
       else
          return &tgl_l3_list;
 
+   case 20:
+      return &empty_l3_list;
+
    default:
       unreachable("Not implemented");
    }