net/sched: cake: avoid separate allocation of struct cake_sched_config

net/sched: cake: avoid separate allocation of struct cake_sched_config

Paolo pointed out that we can avoid separately allocating struct
cake_sched_config even in the non-mq case, by embedding it into struct
cake_sched_data. This reduces the complexity of the logic that swaps the
pointers and frees the old value, at the cost of adding 56 bytes to the
latter. Since cake_sched_data is already almost 17k bytes, this seems
like a reasonable tradeoff.

Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Fixes: bc0ce2bad36c ("net/sched: sch_cake: Factor out config variables into separate struct")
Link: https://patch.msgid.link/20260113143157.2581680-1-toke@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>