coresight: perf: Output trace id only once

With the dynamic traceid allocation scheme in, we output the
AUX_OUTPUT_HWID packet every time event->start() is called.
This could cause too many such records in the perf.data,
while only one per CPU throughout the life time of
the event is required. Make sure we only output it once.

Before this patch:
  $ perf report -D | grep OUTPUT_HW_ID
  ...
  AUX_OUTPUT_HW_ID events:         55  (18.3%)

After this patch:

 $ perf report -D | grep OUTPUT_HW_ID
 ...
 AUX_OUTPUT_HW_ID events:          5  ( 1.9%)

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

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