lockscreen: Add option for showing unlock screen directly

Squash of the following changes, updated for the new SDK:

  From: eray orçunus <erayorcunus@gmail.com>
  Date: Wed, 17 Jun 2015 16:12:19 +0300

      lockscreen: Add option for showing unlock screen directly

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

      Change-Id: I2ceeed348d7e61632b8344f35431f30cba62ca4f
      Ticket-Id: CYNGNOS-1873
Signed-off-by: eray orçunus <erayorcunus@gmail.com>

  From: Danesh M <daneshm90@gmail.com>
  Date: Tue, 17 Nov 2015 20:09:38 -0800

      SettingsProvider: Add missing platform sdk dependency

      Change-Id: I4844eaa0a989bf634a2251e95dc84a505037c012

Change-Id: I0cfb43bfb631fce532dfacdf56455309a04ddfa2

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java