IB/hfi1: switch to netif_napi_add_weight()

Since we'll remove the last argument from netif_napi_add()
soon switch this RDMA driver to netif_napi_add_weight()
for now to avoid cross-tree patches.

Link: https://lore.kernel.org/r/20220705230208.924408-3-kuba@kernel.org


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