Fix status bar flickering

After refactoring NPV, BiometricUnlockController started to receive
authentication callbacks before NotificationPanelViewController.
This means that wakeAndUnlock will start earlier, and the order that
onBiometricAuthenticated and onBiometricRunningStateChanged is not
guaranteed anymore.

This CL checks if we're unlocking with biometrics before showing the
status bar, in order to keep it hidden when dismissing the keyguard,
regardless of callback invocation order.

Test: unlock with face
Test: wait for face timeout
Test: unlock with password
Test: unlock with face after SB is visible
Fixes: 159445348
Change-Id: I43f78f4ab4d0e89e27fcfe5ba527a6c3ff18b0ae