net: do not consume a cacheline for system_page_pool

There is no reason to consume a full cacheline to store system_page_pool.

We can eventually move it to softnet_data later for full locality control.

Fixes: 2b0cfa6e

 ("net: add generic percpu page_pool allocator")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Lorenzo Bianconi <lorenzo@kernel.org>
Cc: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Link: https://lore.kernel.org/r/20240328173448.2262593-1-edumazet@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>