[2/2] frameworks/base: Enable quick unlock

Automatically unlock the lockscreen when the correct pin/password is keyed.

Settings: https://gerrit.omnirom.org/#/c/2605/

Change-Id: I3c1df4b573321a9343d1c339055577d5ca737f14
Merge remote-tracking branch 'cm/android-4.4' into android-4.4