kernel: modules: reorder i40e, mlx4, and mlx5 load priorities

kernel: modules: reorder i40e, mlx4, and mlx5 load priorities

Sets the boot flag for the i40e network device driver
to load it at a more early stage of the boot process.

With commit 0a47d518df0d758e8d3b31264cb0428d57c362c3,
I added a boot priority for the mlx4 and mlx5 drivers.

Also, increase those priorities because I think they
are too low since there is currently no "room" for
built-in network device drivers.
That can cause interface order, i.e., name inconsistencies,
when Mellanox ConnectX cards are inserted or removed.

Signed-off-by: Til Kaiser <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/17990
Signed-off-by: Hauke Mehrtens <[email protected]>