net: page_pool: split the page_pool_params into fast and slow

struct page_pool is rather performance critical and we use
16B of the first cache line to store 2 pointers used only
by test code. Future patches will add more informational
(non-fast path) attributes.

It's convenient for the user of the API to not have to worry
which fields are fast and which are slow path. Use struct
groups to split the params into the two categories internally.

Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Link: https://lore.kernel.org/r/20231121000048.789613-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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