RDMA/bnxt_re: Remove deliver net device event

Since the netdev events of link status is now handled in ib_core,
remove the related code in drivers.

Signed-off-by: Yuyu Li <liyuyu6@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>