perf cs-etm: Move mapping of Trace ID and cpu into helper function

The information to associate Trace ID and CPU will be changing.

Drivers will start outputting this as a hardware ID packet in the data
file which if present will be used in preference to the AUXINFO values.

To prepare for this we provide a helper functions to do the individual ID
mapping, and one to extract the IDs from the completed metadata blocks.

Reviewed-by: James Clark <[email protected]>
Signed-off-by: Mike Leach <[email protected]>
Acked-by: Suzuki Poulouse <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Ganapatrao Kulkarni <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Will Deacon <[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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