sched/core: Avoid double update_rq_clock() in move_queued_task()

Address this case:

  WARNING: CPU: 0 PID: 2070 at ../kernel/sched/core.c:109 update_rq_clock+0x74/0x80
  rq->clock_update_flags & RQCF_UPDATED

  Call Trace:
  update_rq_clock()
  move_queued_task()
  __set_cpus_allowed_ptr()
  ...

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>