KeyguardView: report transiting bouncer as shown

FOD icon is shown until after the bouncer animation
is completed because onKeyguardBouncerChanged isn't
called when the bouncher animation is started.
Call updateStates when starting to show bouncer
and make sure a transitioning bouncer is considered
shown to make the FOD icon dissapear without
overlapping bouncer.

Change-Id: I4e452a6839586775264e087a7820ecc2bcf9a2cc