call kp_exit_timers before probe_exit

Make sure all timer destroyed before execute trace_end closure

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
remove irq disable in kp_exit_timers

There don't have good reason to disable irq when destroy timers.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>