[Settings] Update PIP with new Settings integration

Updates PIP settings to be compatible with new Settings guidelines.

For context we have 2 settings pages PictureInPictureSettings.java
and PictureInPictureDetails.java, both of which inherit from standard
androidx components, so there should not be any other required
changes.

Bug: b/349659719
Flag: EXEMPT refactor
Test: manually enable update and check settings pages
Change-Id: Iafc3cda8cdb2fcdba466755bf537188ee2005dc2