coresight: Clarify comments around the PID of the sink owner

"Process being monitored" and "pid of the process to monitor" imply that
this would be the same PID if there were two sessions targeting the same
process. But this is actually the PID of the process that did the Perf
event open call, rather than the target of the session. So update the
comments to make this clearer.

Reviewed-by: Anshuman Khandual <[email protected]>
Reviewed-by: Mike Leach <[email protected]>
Signed-off-by: James Clark <[email protected]>
Tested-by: Leo Yan <[email protected]>
Tested-by: Ganapatrao Kulkarni <[email protected]>
Signed-off-by: James Clark <[email protected]>
Signed-off-by: Suzuki K Poulose <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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