Adjust SysUI for new insets

- Layout of notif shade is no longer custom, so need to handle
insetsIgnoringVisibility on client.
- Do not special case Keyguard anymore. Just treat it as regular
control target.
- No more special sauce to hide navigation bar on Keyguard.
- Treat it as BEHAVIOR_SHOW_TRANSIENT_BARS_ON_SWIPE but don't
actually do that in DisplayPolicy

Test: InsetsPolicyTest
Test: Lockscreen with PIN
Bug: 118118435
Change-Id: I1edce4fdb792fd97a181165a03957ba5d6d3e551