intel/brw: fix subgroup size of geometry stages for lnl+

Fixes dEQP-VK.subgroups.size_control.*allow_varying_subgroup_size* and
maybe others checking subgroup size.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29177>

src/intel/compiler/brw_compile_vs.cpp

@@ -26,7 +26,8 @@ brw_compile_vs(const struct brw_compiler *compiler,
    prog_data->base.base.ray_queries = nir->info.ray_queries;
    prog_data->base.base.total_scratch = 0;
 
-   brw_nir_apply_key(nir, compiler, &key->base, 8);
+   brw_nir_apply_key(nir, compiler, &key->base,
+                     brw_geometry_stage_dispatch_width(compiler->devinfo));
 
    prog_data->inputs_read = nir->info.inputs_read;
    prog_data->double_inputs_read = nir->info.vs.double_inputs;