Initialize p2p settings

And fix associated changes from the settings.

With p2p_reconnect setting turned on, it means the p2p group can be
started without a group negotiation. Hence, handle p2p group started in
the P2pEnabledState

Also, reinvocation results in supplicant not reporting device address correctly.
Handle that until supplicant fix is fixed.

Bug: 5002384

Change-Id: I335f6e854acd6839f54da9b460b17ad7505b1098