Reset keyguardGoingAway status when AOD is showing.

Bug: 237391074
Test: manual
  1. goto lock screen and show AOD
  2. touch fingerprint sensor to unlock the device
  3. as soon as fingerprint sensor reacts, push power button.
  4. see output of `adb logcat -b events` and verify keyguardGoingAway
     state is reset after SysUI requests to show both lockscreen and
     AOD.
Change-Id: Ibeac8ac92ce51f4fc2aa9cb123812f7ce1cc4b0c