ipoib: switch to netif_napi_add_weight()

We want to remove the weight argument from the basic
netif_napi_add() API and just default to 64.
Switch ipoib to the new API for explicitly specifying
the weight.

Link: https://lore.kernel.org/r/20220705230208.924408-4-kuba@kernel.org


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