Allow dual MAC addresses in device_tracker

This has already been asked as a question in Presence Detection one device with two MAC addresses, but now I’m creating a feature request for this.

What I would want to do is have the mac entry in the known_devices.yaml to be able to hold a list of possible MAC addresses.
This allows for example my laptop to be detected when it’s connected on the network either with the WiFi or Ethernet, without the need for 2 different sensors.