perf lock: Add lock aggregation enum

Introduce the aggr_mode variable to prepare a later code change.

The default is LOCK_AGGR_ADDR which aggregates the result for the lock
instances.

When -t/--threads option is given, it'd be set to LOCK_AGGR_TASK.  The
LOCK_AGGR_CALLER is for the contention analysis and it'd aggregate the
stat by comparing the callstacks.

Signed-off-by: Namhyung Kim <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Waiman Long <[email protected]>
Cc: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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