Ambient Display: Delay charging indicator if about to wake up

Delays the charging indicator on AOD such that it does not show if
the device is about to wake up due to being plugged in, thus avoiding
a perceived flicker.

Change-Id: I603cc3271245d68f7a36367ea55872958a033e53
Fixes: 62598404
Test: Turn off AOD, go to sleep, double tap to trigger ambient display, plug in device, verify no bolt is briefly visible