perf vendor events arm64: AmpereOne: Add missing DefaultMetricgroupName fields

AmpereOne metrics were missing DefaultMetricgroupName from metrics with
"Default" in group name resulting perf to segfault. Add the missing
field to address the issue.

Fixes: 59faeaf8 ("perf vendor events arm64: Fix for AmpereOne metrics")
Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: James Clark <james.clark@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20231201021550.1109196-2-ilkka@os.amperecomputing.comSigned-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/pmu-events/arch/arm64/ampere/ampereone/metrics.json

@@ -231,6 +231,7 @@
         "MetricName": "slots_lost_misspeculation_fraction",
         "MetricExpr": "100 * ((OP_SPEC - OP_RETIRED) / (CPU_CYCLES * #slots))",
         "BriefDescription": "Fraction of slots lost due to misspeculation",
+        "DefaultMetricgroupName": "TopdownL1",
         "MetricGroup": "Default;TopdownL1",
         "ScaleUnit": "1percent of slots"
     },
@@ -238,6 +239,7 @@
         "MetricName": "retired_fraction",
         "MetricExpr": "100 * (OP_RETIRED / (CPU_CYCLES * #slots))",
         "BriefDescription": "Fraction of slots retiring, useful work",
+        "DefaultMetricgroupName": "TopdownL1",
         "MetricGroup": "Default;TopdownL1",
 	"ScaleUnit": "1percent of slots"
     },