sched/fair: Fix kabi borken in sched_domain_shared

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I61E4M
CVE: NA

--------------------------------

The sched_domain_shared structure is only used as pointer, and other
drivers don't use it directly.
Signed-off-by: NGuan Jing <guanjing6@huawei.com>
Reviewed-by: Nzhangjialin <zhangjialin11@huawei.com>
Reviewed-by: NZhang Qiao <zhangqiao22@huawei.com>
Reviewed-by: NChen Hui <judy.chenhui@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

include/linux/sched/topology.h

@@ -82,10 +82,10 @@ struct sched_domain_shared {
 	atomic_t	ref;
 	atomic_t	nr_busy_cpus;
 	int		has_idle_cores;
-	int		nr_idle_scan;
 #ifdef CONFIG_SCHED_STEAL
 	struct sparsemask *cfs_overload_cpus;
 #endif
+	KABI_EXTEND(int		nr_idle_scan)
 };
 
 struct sched_domain {