Remove old animation

 Bug: 10918599
 Shaves ~1.5MB off of Keyguard creation from usage of an
 old-style Alpha animator that would create a draw cache
 The animation is unseen due to screen timings, so simply remove it
 Also adds a bit of de-jank to the non-svelte case by avoiding
 a potential GC_FOR_ALLOC

Change-Id: Id49742d95988f670a44305e4033e7a850d20e675