net: move snowflake callers to netif_napi_add_tx_weight()

Make the drivers with custom tx napi weight call netif_napi_add_tx_weight().

Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220504163725.550782-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>