perf/x86/intel: Track the num of events needs late setup

When a machine supports PEBS v6, perf unconditionally searches the
cpuc->event_list[] for every event and check if the late setup is
required, which is unnecessary.

The late setup is only required for special events, e.g., events support
counters snapshotting feature. Add n_late_setup to track the num of
events that needs the late setup.

Other features, e.g., auto counter reload feature, require the late
setup as well. Add a wrapper, intel_pmu_pebs_late_setup, for the events
that support counters snapshotting feature.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Thomas Falcon <thomas.falcon@intel.com>
Link: https://lkml.kernel.org/r/20250327195217.2683619-3-kan.liang@linux.intel.com