perf jevents: fix no member named 'entries' issue

The struct "pmu_events_table" has been changed after commit
2e255b4f (perf jevents: Group events by PMU, 2023-08-23).
So there doesn't exist 'entries' in pmu_events_table anymore.
This will align the members with that commit. Othewise, below
errors will be printed when run jevent.py:

pmu-events/pmu-events.c:5485:26: error: ‘struct pmu_metrics_table’ has no member named ‘entries’
 5485 |                         .entries = pmu_metrics__freescale_imx8dxl_sys,
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Tested-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230919080929.3807123-1-xu.yang_2@nxp.comSigned-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/pmu-events/jevents.py

@@ -764,8 +764,8 @@ static const struct pmu_sys_events pmu_sys_event_tables[] = {
       continue
     _args.output_file.write(f"""\t{{
 \t\t.metric_table = {{
-\t\t\t.entries = {tblname},
-\t\t\t.length = ARRAY_SIZE({tblname})
+\t\t\t.pmus = {tblname},
+\t\t\t.num_pmus = ARRAY_SIZE({tblname})
 \t\t}},
 \t\t.name = \"{tblname}\",
 \t}},