you are not able to do that from code until and unless there is some api from xiaomi that gives you access to that functionality. I am guessing auto start manager is an app( with privileges of that of a system app, since part of xiaomi modified os) , hence not possible.
But if the device is rooted you can actually disable autostart manager.
Still whatsapp , facebook and many more apps doing this may be because of they have tie ups with Xiaomi to be in the whitelist. But its just a guess.

you wont be able to do that from code until and unless there is some api from xiaomi that gives you access to that functionality. I am guessing auto start manager is an app( with privileges of that of a system app, since part of xiaomi modified os) , hence not possible. On the other-hand if the device is rooted you can actually disable autostart manager.
Still whatsapp , facebook and many more apps doing this may be because of they have tie ups with Xiaomi to be in the whitelist. But its just a guess.