perf header: Do validation of perf.data HEADER_CPU_DOMAIN_INFO

As suggested in an unrelated sashiko review:

  https://sashiko.dev/#/patchset/20260407195145.2372104-1-acme%40kernel.org

"
Could a malformed perf.data file provide out-of-bounds values for cpu and
domain?
These variables are read directly from the file and used as indices for
cd_map and cd_map[cpu]->domains without any validation against
env->nr_cpus_avail or max_sched_domains.
Similar to the issue above, this is an existing lack of validation that
becomes apparent when looking at the allocation boundaries.
"

Validate it.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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