Keep the PIP at the shifted position when the Settings is shown

Some top level Settings menus launch activities from other packages.
In that case, they should be considered as a part of the Settings
if they follow the Leanback's side panel style.

Add such activities to the whitelist to keep the PIP position.

Bug: 31142005
Change-Id: I12cab611b346154048cbd61f6a678f23b5a10c00