When roam from legacy to mlo, vdev1 is updated first, ml peer is created,
but failed to attach since it is link vdev, then vdev0 is updated, ml peer
is created again, ref count is 1.
When disconnect, stop vdev1 first, in stop event handler, ml peer ref count
becomes 0, mlo_peer_cleanup is called unexpectedly.
mlo_peer_cleanup should be called after MLO vdev0 stopped.
To fix it, change wlan_mlo_peer_create, mlo_dev_mlpeer_attach is called if
the ml peer not attached and can't be found.
Change-Id: Iae3b2b498849646ae71154484b555a7fc9a36017
CRs-Fixed: 3277886
0e52b90c77