Consolidate the 2 app button prefernece controllers.

- move the fuelgauge app button controller and the button dialog
fragment into app info package and change app detail fragment to use
that controller instead.
- remove the original appinfo/AppActionButtonPreferenceController

Change-Id: I94ca072a8dfe6051853eb23efa1f96ac3e13d79d
Fixes: 80312809
Test: make RunSettingsRoboTests
11 files changed