[ROSP] Add view models skeletons for popup chips

This CL sets up skeleton code that will be needed
to display popup chips in the right hand side
of the status bar. This will mirror existing RON chips.

Bug: b/384736699
Flag: com.android.systemui.status_bar_popup_chips
Change-Id: Ia52e76f1c27f3950eb11aababce9c0bd02882375
7 files changed