Make ListActivity handle insets properly

This CL makes sure each list item is able to be scrolled to a position
which makes it not be obscrued by the system window insets.

Fix: 378760013
Bug: 309578419
Flag: com.android.window.flags.enforce_edge_to_edge
Test: Start com.android.settings/.development.AppPicker, and make sure
      all the items be able to be revealed by scrolling in combinations
      of navigation modes and screen orientations.
Change-Id: I6ba64d28a3679a78510647bd67516e49baadba5d