Lock screen: Quick Unlock feature (1/2)

Port of QU feature. This one allows to unlock the device from lock screen without pressing the enter button (just enter the pin/password).
Option stored in lock screen settings.

Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Signed-off-by: Paul Beeler <sparksco@gmail.com>