coresight: docs: Add information about the topology representations

coresight: docs: Add information about the topology representations

Update the CoreSight documents to describe the new connections directory
and the links between CoreSight devices in this directory.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200518180242.7916-7-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>