thunderbolt: Add documentation how Thunderbolt bus can be used

Since there are no such tool yet that handles all the low-level details
of connecting devices and upgrading their firmware, add a small document
that shows how the Thunderbolt bus can be used directly from command
line.

Signed-off-by: Mika Westerberg <[email protected]>
Reviewed-by: Yehezkel Bernat <[email protected]>
Reviewed-by: Michael Jamet <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Andreas Noever <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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