sched/topology: Add __init for sched_init_domains()

sched_init_domains() is only used in initialization

Signed-off-by: Bing Huang <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

kernel/sched/topology.c

···
  * Set up scheduler domains and groups.  For now this just excludes isolated
  * CPUs, but could be used to exclude other special cases in the future.
  */
-int sched_init_domains(const struct cpumask *cpu_map)
+int __init sched_init_domains(const struct cpumask *cpu_map)
 {
 	int err;