intel/isl/xe2: Disable route of Sampler LD message to LSC

This optimization is causing some tests groups to fail, like:
dEQP-VK.image.mutable.2d_array.*
dEQP-VK.api.copy_and_blit.core.blit_image.all_formats.*

So disabling it until properly fixed.

Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Rohan Garg <rohan.garg@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27016>

src/intel/isl/isl_format.c

@@ -1220,6 +1220,12 @@ isl_format_rgbx_to_rgba(enum isl_format rgbx)
 bool
 isl_format_support_sampler_route_to_lsc(enum isl_format fmt)
 {
+   /* TODO/FIXME: even only enabling the optimization with formats below this
+    * is causing some tests to fail so completely disabling this optimization
+    * for now.
+    */
+   return false;
+
    switch (fmt) {
    case ISL_FORMAT_R8_UNORM:
    case ISL_FORMAT_R8G8_UNORM: