netdevsim: dev: Initialize FIB module after debugfs

stable inclusion
from stable-5.10.28
commit f33d87047323f2d1d77c5a96e5d713dea0bd3ee9
bugzilla: 51779

--------------------------------

[ Upstream commit f57ab5b7 ]

Initialize the dummy FIB offload module after debugfs, so that the FIB
module could create its own directory there.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by:   Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>