FW sends a disconnect request to HOST while roaming failure
through event WMI_VDEV_DISCONNECT_EVENTID per vdev id.
Fix is:
1. Process WMI_VDEV_DISCONNECT_EVENTID and issue disconnection.
2. Make WMI_VDEV_DISCONNECT_EVENTID event as wakable
Change-Id: Ic1e83aace48a3e8424f23641b0e77c66f4283587
CRs-Fixed: 2731952