Add titles to PreferenceFragments and PreferenceScreens for watches.

Preferences lack a title on watch type devices due to lack of ActionBar
support. A custom ListView was added to use a custom wrapper adapter to
add a persistent header view at the top of the ListView that developers
would not be able to remove via the ListView API.

Bug: 27962897
Change-Id: I6bccecf85592d9507e0c7a04c9a035617001e9ef