Move the code setting ts->got_idle_tick into tick_sched_do_timer() to
avoid code duplication.

No intentional changes in functionality.
Suggested-by: NFrederic Weisbecker <frederic@kernel.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: NFrederic Weisbecker <frederic@kernel.org>