perf metrics: Sort the Default metricgroup

The new default mode will print the metrics as a metric group. The
metrics from the same metric group must be adjacent to each other in the
metric list. But the metric_list_cmp() sorts metrics by the number of
events.

Add a new sort for the Default metricgroup, which sorts by
default_metricgroup_name and metric_name.

Add is_default in the struct metric_event to indicate that it's from
the Default metricgroup.

Store the displayed metricgroup name of the Default metricgroup into
the metric expr for output.

Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Kan Liang <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Ahmad Yasin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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