FooterPreference directs summary to title of preference

To compatible with preference controller design,
we override implementation of setSummary() which
directs summary to title of preference.

So, footer preference can be simply created in xml
and controlled by BasePreferenceController.

Test: visual, robotest
Bug: 124129485
Change-Id: I453ffc35761ecf24f2ac1415e0d674ac73c9c475
2 files changed