Since Android is generating a new mac address for your wifi interface at every reboot and Connman is storing the mac address in its services you would need to enter your wifi passwords every time you reboot.
Fortunately there is a way to lock the mac address.
1) install hexedit:
sudo apt install hexedit
2)
sudo hexedit /nvdata/APCFG/APRDEB/WIFI
and set a mac address in bytes 04-09 (mind that the base is 0, so it starts at the 5th byte) of the first row (0)
3) set the i attr on the file:
sudo chattr +i /nvdata/APCFG/APRDEB/WIFI
This will lock down the mac address.
I've updated
DebianTP3 Wiki and other wiki entries.