ModDisplay: fixed mysterious bootloops
Under certain circumstances there seems to be some kind of race
condition when we are trying to get instance of Keyguard service during
DisplayPowerController service construction. Service manager may get
confused and deadlocked preventing device from booting.
Solution: Get Keyguard service later, when we are sure system is fully
initialized.
Merge branch 'jellybean' of https://github.com/GravityBox/GravityBox.git into jellybean