sched/rt: Substract number of tasks of throttled queues from rq->nr_running

sched/rt: Substract number of tasks of throttled queues from rq->nr_running

Now rq->rt becomes to be able to be in dequeued or enqueued state.
We add new member rt_rq->rt_queued, which is used to indicate this.
The member is used only for top queue rq->rt_rq.

The goal is to fit generic scheme which is used in deadline and
fair classes, i.e. throttled rt_rq's rt_nr_running is beeing
substracted from rq->nr_running.

Signed-off-by: Kirill Tkhai <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/1394835300.18748.33.camel@HP-250-G1-Notebook-PC
Cc: [email protected]
Signed-off-by: Ingo Molnar <[email protected]>