2/N Use KeyguardHostViewController in KeyguardBouncer.

This mostly proxies existing calls through to the view. A few
exceptions were made where it was obvious what to change.

Also, make ViewController take a View type to streamling
initialization a bit more.

Bug: 166448040
Test: atest SystemUITests && manual.
Change-Id: If849ff57c4b8462e07cc9a4b0546fe7d2a6a0c0a