In this post they talk about a very similar subject, and there's workaround for it, you should also try updating the Yocto image of your Galileo as well as it's firmware. If you have any other doubts, don't hesitate to ask.
The problem solved from Re: Wireless not auto starting on Gen 2 with 6205 card!
Thank you very much.
Note: If you maintain both a wired and Wi-Fi connection at reboot, only the wired connection will be established. If you removed the wired connection, then the Wi-Fi will attempt to connect. Reinserting the wired connection will not change this connection model, unless Wi-Fi drops.
thanks you again for your time!