perf test coresight: Add relevant documentation about ARM64 CoreSight testing

Add/improve documentation helping people get started with CoreSight and
perf as well as describe the testing and how it works.

Reviewed-by: James Clark <[email protected]>
Signed-off-by: Carsten Haitzler <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Suzuki Poulouse <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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