net/mlx5: E-switch, Fix duplicate lag creation

If creating bond first and then enabling sriov in switchdev mode,
will hit the following syndrome:

mlx5_core 0000:08:00.0: mlx5_cmd_out_err:778:(pid 25543): CREATE_LAG(0x840) op_mod(0x0) failed, status bad parameter(0x3), syndrome (0x7d49cb), err(-22)

The reason is because the offending patch removes eswitch mode
none. In vf lag, the checking of eswitch mode none is replaced
by checking if sriov is enabled. But when driver enables sriov,
it triggers the bond workqueue task first and then setting sriov
number in pci_enable_sriov(). So the check fails.

Fix it by checking if sriov is enabled using eswitch internal
counter that is set before triggering the bond workqueue task.

Fixes: f019679e

 ("net/mlx5: E-switch, Remove dependency between sriov and eswitch mode")
Signed-off-by: Chris Mi <cmi@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>