perf trace-event: Constify print arguments

Capture that these functions don't mutate their input.

Reviewed-by: Namhyung Kim <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Ben Gainey <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Dominique Martinet <[email protected]>
Cc: Ilkka Koskinen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Oliver Upton <[email protected]>
Cc: Paran Lee <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steinar H. Gunderson <[email protected]>
Cc: Steven Rostedt (VMware) <[email protected]>
Cc: Thomas Falcon <[email protected]>
Cc: Weilin Wang <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Yang Li <[email protected]>
Cc: Ze Gao <[email protected]>
Cc: Zixian Cai <[email protected]>
Cc: zhaimingbing <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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