Show bouncer after rebooting

When bypass is active, show bouncer after rebooting, if bouncer
is not visible.

Test: atest BiometricsUnlockControllerTest
Test: atest KeyguardUpdateMonitorTest
Test: without bypass, reboot, observe no scanning animation
Test: without bypass, unlock on lock screen
Test: with bypass, reboot, observe scanning animation, look at bouncer
Test: with bypass, bypass lock screen
Fixes: 135773409
Change-Id: Ic2f0bb137b645e132dc9aae282206c3e84895ce1