lockscreen: Add option for showing unlock screen directly (1/3)

* Option appears on PIN,pattern and password methods
* User should press back button to see swipe-up-to-unlock screen.
* Instantly hides keyguard if Smart Lock has unlocked phone.

CYNGNOS-1873

Change-Id: I2ceeed348d7e61632b8344f35431f30cba62ca4f
Signed-off-by: eray orçunus <erayorcunus@gmail.com>