perf lock: Handle lock contention tracepoints

When the lock contention events are used, there's no tracking of
acquire and release.  So the state machine is simplified to use
UNINITIALIZED -> CONTENDED -> ACQUIRED only.

Note that CONTENDED state is re-entrant since mutex locks can hit two
or more consecutive contention_begin events for optimistic spinning
and sleep.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20220615163222.1275500-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>