sched/fair: remove erroneous RCU_LOCKDEP_WARN from start_cpu()

Fixes: https://bugs.linaro.org/show_bug.cgi?id=3075

Change-Id: I62d714fc4b9366a9b2535649aa92d1edc840cf94
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Brendan Jackman <brendan.jackman@arm.com>
Signed-off-by: Chris Redpath <chris.redpath@arm.com>

Author: deggeman

kernel/sched/fair.c

@@ -6234,9 +6234,6 @@ static int start_cpu(bool boosted)
 {
 	struct root_domain *rd = cpu_rq(smp_processor_id())->rd;
 
-	RCU_LOCKDEP_WARN(rcu_read_lock_sched_held(),
-			   "sched RCU must be held");
-
 	return boosted ? rd->max_cap_orig_cpu : rd->min_cap_orig_cpu;
 }