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
SystemUI: Remove obsolete layout params (fix lint warning)

Change-Id: I41f688c9a351189c9929dc1f4947c0124820f5ad