perf stat: Add print_aggr_cgroup() for --for-each-cgroup and --topdown

perf stat: Add print_aggr_cgroup() for --for-each-cgroup and --topdown

Normally, --for-each-cgroup only works with AGGR_GLOBAL.  However
the --topdown on some cpu (e.g. Intel Skylake) converts it to the
AGGR_CORE internally.

To support those machines, add print_aggr_cgroup and handle the events
like in print_cgroup_events().

  $ perf stat -a --for-each-cgroup system.slice,user.slice --topdown sleep 1
  nmi_watchdog enabled with topdown. May give wrong results.
  Disable with echo 0 > /proc/sys/kernel/nmi_watchdog

   Performance counter stats for 'system wide':

                               retiring   bad speculation  frontend bound  backend bound
  S0-D0-C0  2  system.slice       49.0%            -46.6%           31.4%
  S0-D0-C1  2  system.slice       55.5%              8.0%           45.5%          -9.0%
  S0-D0-C2  2  system.slice       87.8%             22.1%           30.3%         -40.3%
  S0-D0-C3  2  system.slice       53.3%            -11.9%           45.2%          13.4%
  S0-D0-C0  2  user.slice        123.5%              4.0%           48.5%         -75.9%
  S0-D0-C1  2  user.slice         19.9%              6.5%           89.9%         -16.3%
  S0-D0-C2  2  user.slice         29.9%              7.9%           71.3%          -9.1
  S0-D0-C3  2  user.slice         28.0%              7.2%           43.3%          21.5%

         1.004136937 seconds time elapsed

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/20221114230227.1255976-20-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>