Initialize the peer state to disconnected(OL_TXRX_PEER_STATE_DISC)
after creating the peer. This will also help in roaming case not
to send a vdev up again to the firmware, since the legacy code
checks for this initial state of the peer.
Change-Id: I5b5a664a81c1e295e405c648c1124e9ac844c9cb
CRs-Fixed: 2150449