mlx4: Add support for persistent NAPI config to RX CQs

mlx4: Add support for persistent NAPI config to RX CQs

Use netif_napi_add_config to assign persistent per-NAPI config when
initializing RX CQ NAPIs.

Presently, struct napi_config only has support for two fields used for
RX, so there is no need to support them with TX CQs, yet.

Signed-off-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20241011184527.16393-10-jdamato@fastly.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>