Wait for keyguard draw before stopping boot animation

- Add check for keyguard drawn before stopping boot animation.
  Otherwise blank screen can happen.
- Bind to keyguard service when sysui is launched to reduce waiting
  time later.
- Increase keyguard timeout to 5 secs if it is not boot completed.
  Otherwise (= normal screen on), keep the current 1 sec.
  This timeout can still lead into blank screen so use bigger timeout
  during boot-up to prevent such case.

bug: 37867510
Test: many reboots

Change-Id: Ibfdc42d295bb1d3f5b4ea316fe5aca9ab875e4be