mlxfw can be compiled as external module while mlx5_core can be
builtin, in such case mlx5 will act like mlxfw is disabled.
Since mlxfw is just a service library for mlx* drivers,
imply it in mlx5_core to make it always reachable if it was enabled.
Fixes: 3ffaabecd1 ("net/mlx5e: Support the flash device ethtool callback")
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
bad861f31b