sched: Add time unit suffix to sched sysctl knobs

Unlike others, sched_migration_cost, sched_time_avg and
sched_shares_window doesn't have time unit as suffix. Add them.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1345083330-19486-1-git-send-email-namhyung@kernel.org


Signed-off-by: Ingo Molnar <mingo@kernel.org>