WIP: supplicant: Store assigned addr for P2P group joins

This is completely untested right now (and, I am not sure I have HW to test it). But, I would appreciate a quick look whether the approach to use nm_device_set_dev2_ip_config and how to pass the addresses around is correct in principle.

A P2P Group Owner may assign an IP address and netmask to us. Store this address so that it can be retrieved later during the IP configuration stage.

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