perf stat: Rename "aggregate-number" to "cpu-count" in JSON

As the JSON output has been broken for a little while, I guess there are
not many users.  Let's rename the field to more intuitive one. :)
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20221123180208.2068936-15-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/stat-display.c

@@ -281,19 +281,19 @@ static void print_aggr_id_json(struct perf_stat_config *config,
 
 	switch (config->aggr_mode) {
 	case AGGR_CORE:
-		fprintf(output, "\"core\" : \"S%d-D%d-C%d\", \"aggregate-number\" : %d, ",
+		fprintf(output, "\"core\" : \"S%d-D%d-C%d\", \"cpu-count\" : %d, ",
 			id.socket, id.die, id.core, nr);
 		break;
 	case AGGR_DIE:
-		fprintf(output, "\"die\" : \"S%d-D%d\", \"aggregate-number\" : %d, ",
+		fprintf(output, "\"die\" : \"S%d-D%d\", \"cpu-count\" : %d, ",
 			id.socket, id.die, nr);
 		break;
 	case AGGR_SOCKET:
-		fprintf(output, "\"socket\" : \"S%d\", \"aggregate-number\" : %d, ",
+		fprintf(output, "\"socket\" : \"S%d\", \"cpu-count\" : %d, ",
 			id.socket, nr);
 		break;
 	case AGGR_NODE:
-		fprintf(output, "\"node\" : \"N%d\", \"aggregate-number\" : %d, ",
+		fprintf(output, "\"node\" : \"N%d\", \"cpu-count\" : %d, ",
 			id.node, nr);
 		break;
 	case AGGR_NONE: