perf sched: Cap max_cpu at MAX_CPUS in timehist sample processing

perf sched: Cap max_cpu at MAX_CPUS in timehist sample processing

perf_timehist__process_sample() updates sched->max_cpu from the
sample CPU without bounds checking.  Later code uses max_cpu + 1 as
an iteration count over arrays allocated with MAX_CPUS entries
(curr_thread, cpu_last_switched).  A recording with CPU IDs >= MAX_CPUS
causes out-of-bounds array accesses.

Also cap the env->nr_cpus_online initialization of max_cpu in
perf_sched__timehist(), which could exceed MAX_CPUS on very large
systems.

Add bounds checks before both max_cpu updates, matching the pattern
already used in map_switch_event().

Fixes: 49394a2a24c7 ("perf sched timehist: Introduce timehist command")
Reviewed-by: David Ahern <dsahern@kernel.org>
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>