perf python tracepoint: Switch to using parse_events

Rather than manually configuring an evsel, switch to using
parse_events for greater commonality with the rest of the perf code.

Reviewed-by: Howard Chu <howardchu95@gmail.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://lore.kernel.org/r/20250228222308.626803-12-irogers@google.com


Signed-off-by: Namhyung Kim <namhyung@kernel.org>