perf Documentation: Describe the PMU naming convention

It is an existing convention to use suffixes with PMU names. Try to
capture that convention so that future PMU devices may adhere to it.

The name of the file and date within the file try to follow existing
conventions, particularly sysfs-bus-event_source-devices-events.

Reviewed-by: James Clark <[email protected]>
Reviewed-by: Kan Liang <[email protected]>
Reviewed-by: Leo Yan <[email protected]>
Reviewed-by: Randy Dunlap <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Bharat Bhushan <[email protected]>
Cc: Bhaskara Budiredla <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Thomas Richter <[email protected]>
Cc: Tuan Phan <[email protected]>
Cc: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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