sched: remove 'now' use from assignments

change all 'now' timestamp uses in assignments to rq->clock.

( this is an identity transformation that causes no functionality change:
  all such new rq->clock is necessarily preceded by an update_rq_clock()
  call. )

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --cc kernel/sched.c
Simple merge

diff --cc kernel/sched_fair.c
Simple merge

diff --cc kernel/sched_rt.c
Simple merge