perf cs-etm: Start reading 'Z' --itrace option

Recently the 'Z' --itrace option was added to override detection
of timeless decoding. This is also useful in Coresight to work around
issues with invalid timestamps on some hardware.

When the 'Z' option is provided, the existing timeless decoding mode
will be used, even if timestamps were recorded.

Signed-off-by: James Clark <[email protected]>
Reviewed-by: Leo Yan <[email protected]>
Cc: Al Grant <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Branislav Rankov <[email protected]>
Cc: Denis Nikitin <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Namhyung Kim <[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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