Remove some code from NPVC and ShadeViewController

Moves one method in NPVC to its one call site. Moves another to
ShadeController and deprecates it. Helps to decouple status bar
icon hiding from NPVC.

Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT
Test: Manual and presubmits
Bug: 303267342
Change-Id: If60efec91aba69161d8ce3a2c3037d2721e13e62