Lock Screen: quick unlock feature

Allows unlocking of the device without pressing enter for passwords and pins.

Change-Id: Ia85164a9758c8c5a3a11b48fed4092cdbf6dbec0
Signed-off-by: Evan Anderson <evan1124@gmail.com>

Conflicts:
	packages/Keyguard/src/com/android/keyguard/KeyguardAbsKeyInputView.java