Revert "Refactor KeygaurdController using state machine"

Revert submission 20110539-KeyguardController

Reason for revert: investigating b/266953937

Reverted changes: /q/submissionid:20110539-KeyguardController

Change-Id: Ia54dbcfd5ed19acacc44f6c242a0ba0c93514e02
9 files changed