sched: Remove rq argument to sched_class::task_waking()

sched: Remove rq argument to sched_class::task_waking()

In preparation of calling this without rq->lock held, remove the
dependency on the rq argument.

Reviewed-by: Frank Rowand <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Andrew Morton <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>