sched: Add dummy version of sched_group_set_idle()

Fix the following error when build with CONFIG_GROUP_SCHED_WEIGHT &&
!CONFIG_FAIR_GROUP_SCHED:

kernel/sched/core.c:9634:15: error: implicit declaration of function
'sched_group_set_idle'; did you mean 'scx_group_set_idle'? [-Wimplicit-function-declaration]
  9634 |         ret = sched_group_set_idle(css_tg(css), idle);
       |               ^~~~~~~~~~~~~~~~~~~~
       |               scx_group_set_idle

Fixes: e179e80c ("sched: Introduce CONFIG_GROUP_SCHED_WEIGHT")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409220859.UiCAoFOW-lkp@intel.com/Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/sched/sched.h

@@ -582,6 +582,7 @@ static inline void set_task_rq_fair(struct sched_entity *se,
 #endif /* CONFIG_SMP */
 #else /* !CONFIG_FAIR_GROUP_SCHED */
 static inline int sched_group_set_shares(struct task_group *tg, unsigned long shares) { return 0; }
+static inline int sched_group_set_idle(struct task_group *tg, long idle) { return 0; }
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 
 #else /* CONFIG_CGROUP_SCHED */