This adaptation channel in BCM affects how the mirrors fold and unfold :
ENG141635-ENG116665-Spiegelverstellung-Funk Spiegelanklappung Modus,by look command via remote control key ,5
Here's more detailed guide :
BUT you can't make them fold/unfold with ignition. You can however, make them fold / unfold with a long press of lock or unlock button. And naturally they unfold automatically as well when you start to drive. I think it was 15km/h after they unfold.