perf evsel: Rename perf_evsel__store_ids() to evsel__store_id()

As it is a 'struct evsel' method, not part of tools/lib/perf/, aka
libperf, to whom the perf_ prefix belongs.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-stat.c

@@ -636,7 +636,7 @@ try_again_reset:
 			stat_config.unit_width = l;
 
 		if (perf_evsel__should_store_id(counter) &&
-		    perf_evsel__store_ids(counter, evsel_list))
+		    evsel__store_ids(counter, evsel_list))
 			return -1;
 	}