Fix jank when pin/pattern is shown

- Only update layout params of status bar window when needed
- Do not update security method all the time, only when needed (only
  when reset gets called)
- Check for actual used security method when updating states for
  bouncer

Bug: 18505838
Change-Id: Ib3d0021c0cc364fa5598e06e0a2bae059ae79cbe