thunderbolt: Notify userspace about firmware CM tunneling events

thunderbolt: Notify userspace about firmware CM tunneling events

In the same way we do for software connection manager, send
notifications about tunneling changes done by the firmware connection
manager as well. There are some limitations with this though, for
example we only get "DP Configuration Changed" message from the firmware
without any indication if DisplayPort tunnel was activated or
deactivated. Also we don't get information about the tunnel itself
either so the event then looks like:

  TUNNEL_EVENT=changed
  TUNNEL_DETAILS=(DP)

XDomain connections are similar to what the software connection manager
sends.

Signed-off-by: Alan Borzeszkowski <alan.borzeszkowski@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>