Add logic to forward foldable device state to native cameraserver.

This change adds two methods to CameraServiceProxy to be used within
system_server for setting camera device state flags. It also updates
DisplayFoldController to leverage these methods.

Bug: 153788656
Bug: 154038218
Bug: 159401801
Test: Trigger fold and verify camera's toggle
Change-Id: I08392a62bc65d10a0715ef0d831c8bb919035a5d