perf cs-etm: Refactor timestamp variable names

Remove ambiguity in variable names relating to timestamps.

A later commit will save the sample kernel timestamp in one of the etm
structs, so name all elements appropriately to avoid confusion.

This is also removes some ambiguity arising from the fact that the
--timestamp argument to perf record refers to sample kernel timestamps,
and the /timestamp/ event modifier refers to CS timestamps, so the term
is overloaded.

Signed-off-by: James Clark <[email protected]>
Reviewed-by: Mathieu Poirier <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Al Grant <[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: Leo Yan <[email protected]>
Cc: Mark Rutland <[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: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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