coresight: cti: Add device tree support for v8 arch CTI

The v8 architecture defines the relationship between a PE, its optional ETM
and a CTI. Unlike non-architectural CTIs which are implementation defined,
this has a fixed set of connections which can therefore be represented as a
simple tag in the device tree.

This patch defines the tags needed to create an entry for this PE/ETM/CTI
relationship, and provides functionality to implement the connection model
in the CTI driver.

Signed-off-by: Mike Leach <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Signed-off-by: Mathieu Poirier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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