This will allow us to access it from SystemUI.
Bug: 346519570
Test: builds
Flag: EXEMPT trivial refactor
Change-Id: I5bc480bd4eb0cbf8a26989dd11c064e66e5ee70e
So that when it's moved to SettingsLib, it doesn't need to carry that baggage.
Bug: 346519570
Test: atest com.android.settings.notification.modes
Flag: android.app.modes_ui
Change-Id: I7911a521d96f5dbac2c2395171d324b7b54b8b07
Also fixed a handful of style issues / warnings along the way.
Fixes: 341950853
Fixes: 341910620
Test: atest com.android.settings.notification.modes
Flag: android.app.modes_ui
Change-Id: I65900941fcdf53824caf052fd0a24401c1bfb476