Initialise Notification*Manager dependencies directly.

Currently, adding a new dependency to any of these classes means
updating the constructors of any subclasses, and the construction in the
corresponding SystemUIFactory classes and subclasses. In particular,
updating these in separate vendor/ projects is annoying. So, initialise
the dependencies using field initialisers. The downside is that it's
harder to notice circular Dependencys.

Bug: 63874929
Bug: 62602530
Test: runtest systemui
Test: Compile and run
Change-Id: I21d58d0cc0edeb6d53fb7b387c9baeec7bd80589