Enable use of of CompoundButtons in RemoteViews

This change adds @RemoteView and @RemotableViewMethod to the relevant
views we'd like to enable. New APIs have been added to set Icons in
CompooundButton and Switch.

onCheckedChange support will be added in a follow-up CL.

CompoundButton.setChecked and RadioGroup.check aren't directly remotable
since RemoteViews will need to control those calls directly to ensure
that any onCheckedChange listeners aren't triggered by RemoteViews
actions.

Bug: 179245670
Test: manual, atest
Change-Id: I85e2aee62cf39ed008d9c9c1fece813293841fbd