net/sched: sch_cake: annotate data-races in cake_dump_stats() (IV)

net/sched: sch_cake: annotate data-races in cake_dump_stats() (IV)

cake_dump_stats() runs without qdisc spinlock being held.

In this fourth patch, I add READ_ONCE()/WRITE_ONCE() annotations
for the following fields:

- avg_peak_bandwidth
- buffer_limit
- buffer_max_used
- avg_netoff
- max_netlen
- max_adjlen
- min_netlen
- min_adjlen
- active_queues
- tin_rate_bps
- bytes
- tin_backlog

Other annotations are added in following patch, to ease code review.

Fixes: 046f6fd5daef ("sched: Add Common Applications Kept Enhanced (cake) qdisc")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://patch.msgid.link/20260427083606.459355-5-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>