SystemUI: Pass touch events to pulsing gesture listener only if dozing

PulsingGestureListener should handle touch events only in the
dozing state (AOD/ambient).

Otherwise lockscreen DT2S and AOD DT2W will be in conflict.

Explanation:
Enable AOD, DT2W and DT2S in the display settings.

In the scenerio, touch events are passed to
first NotificationPanelView then NotificationShadeWindowView.

So first NotificationPanelView(Controller) detects the double tap
and put the screen to sleep (hence dozing = true).
Then as the NotificationShadeWindowView(Controller) detects the double tap at dozing,
it wakes up from the AOD immediately [from PulsingGestureListener].

so it won't let the screen to sleep on double tap the lockscreen
when AOD and DT2W are available.

PulsingGestureListener is supposed to receive touch events only in
the dozing state, so it won't cause this conflict.

Test:
- Enable AOD, DT2W and DT2S in the display settings
- Double tap in the lockscreen, it will go to AOD screen.

Change-Id: I6ede700e690ad4c37fea64419cfe8a53d64a9e9a