KeyguardViewMediator: Play lock screen sound sooner

When the screen is locked, there is a long pause before the lock
sound actually plays.

This makes that sound happen much sooner.

Also modified Lock.ogg slightly to remove the initial silence.

Change-Id: Iede7a5d22291d1ada98800d2b380c255547df61d
Camera button support (1/2)

Add new bitmask for Camera button and "hasCamera" boolean.
For those devices that have dedicated Camera key
(like Sony ZL/ZR/Z1/...)

Change-Id: I1a6681664f9f3fd3f30221ba10b082cb5f8cafca
Camera button support: make it actually work

Previous commits were merged so fast that I didn't even
added the code that actually DOES launch the camera.
Let me fix that.

Change-Id: I4fcb3c46e5fd50e273dcf19fd3eb35a3f9d979e0
Merge remote-tracking branch 'cm/cm-10.2' into cm-10.2