perf probe: Remove unused add_perf_probe_events

add_perf_probe_events has been unused since 2015's commit
b02137cc ("perf probe: Move print logic into cmd_probe()")
which confusingly now uses perf_add_probe_events.

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20240929010659.430208-1-linux@treblig.org


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