Use simple class names for Dumpables

Some Dumpables are registered with their fully-qualified class names,
which makes the list of views in Android Bug Tool harder to use.

This change switches those dumpable registrations to use the simple name
(just the class name, without the package name) instead.

Bug: 283097421
Test: presubmit
Change-Id: I7d04157784c0becbb2e0eadedf278c6ddcad0baf