Add scramble pin layout global setting.

Change-Id: Ic4173a0d65e6bc22ea5ab3061139af12582aac5a
Keyguard: Add option to scramble pin layout when unlocking (2/2).

Change-Id: Ibe8611eb0b8a5bd9275bc96682d2cbafaa37d8f5
Merge pull request #78 from CyanogenMod/cm-11.0

Update to upstream