perf cs-etm: Only track threads instead of PID and TIDs

PIDs and TIDs are already contained within the thread struct, so to
avoid inconsistencies drop the extra members on the etm queue and only
use the thread struct.

At the same time stop using the 'unknown' thread. In a later commit
we will be making samples from multiple machines so it will be better
to use the idle thread of each machine rather than overlapping unknown
threads. Using the idle thread is also better because kernel addresses
with a previously unknown thread will now be assigned to a real kernel
thread.

Committer notes:

Resolved conflicts with:

  perf addr_location: Add init/exit/copy functions
  perf thread: Add accessor functions for thread
  perf thread: Remove notion of dead threads

That were present in tmp.perf-tools.next only.

Reviewed-by: Leo Yan <[email protected]>
Reviewed-by: Mike Leach <[email protected]>
Signed-off-by: James Clark <[email protected]>
Acked-by: Suzuki Poulouse <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Suzuki Poulouse <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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