intel: drop unused is_scalar function parameter in brw_nir_apply_key

Signed-off-by: Rohan Garg <rohan.garg@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23098>

src/intel/compiler/brw_nir.c

@@ -1824,8 +1824,7 @@ void
 brw_nir_apply_key(nir_shader *nir,
                   const struct brw_compiler *compiler,
                   const struct brw_base_prog_key *key,
-                  unsigned max_subgroup_size,
-                  bool is_scalar)
+                  unsigned max_subgroup_size)
 {
    bool progress = false;