sched: Remove unused inline function __rq_clock_broken()

These is no caller in tree since commit
523e979d ("sched/core: Use PELT for scale_rt_capacity()")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210914095244.52780-1-yuehaibing@huawei.com

kernel/sched/sched.h

@@ -1426,11 +1426,6 @@ static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
 
 extern void update_rq_clock(struct rq *rq);
 
-static inline u64 __rq_clock_broken(struct rq *rq)
-{
-	return READ_ONCE(rq->clock);
-}
-
 /*
  * rq::clock_update_flags bits
  *