sched: s/sched_latency/sched_min_granularity

runtime limit and wakeup granularity used to be a function of
granularity and that was incorrect changed to sched_latency.

Fix this to make wakeup granularity a function of min-granularity,
and the runtime limit equal to latency.
Signed-off-by: NIngo Molnar <mingo@elte.hu>

kernel/sched.c

@@ -4921,8 +4921,8 @@ static inline void sched_init_granularity(void)
 	if (sysctl_sched_latency > limit)
 		sysctl_sched_latency = limit;
 
-	sysctl_sched_runtime_limit = sysctl_sched_latency * 5;
-	sysctl_sched_wakeup_granularity = sysctl_sched_latency / 2;
+	sysctl_sched_runtime_limit = sysctl_sched_latency;
+	sysctl_sched_wakeup_granularity = sysctl_sched_min_granularity / 2;
 }
 
 #ifdef CONFIG_SMP