SnapdragonCamera: limit AF animation FPS

Currently AF animation depends on RenderOverlay's onDraw() method and
is called at default 60 FPS. Switch to ValueAnimator and invalidates
RenderOverlay at given FPS.

Change-Id: I9cff5d6e99bb7f8ecd579c7935a092f8feba341c
CRs-Fixed: 846169
3 files changed