net/mlx5: E-switch, Remove vport enabled check

An eswitch vport of the devlink port is always enabled before a
devlink port is registered. And a eswitch vport is always disabled
after a devlink port is unregistered.
Hence avoid the vport enabled check in the devlink callback routine.
Such check is only applicable in the legacy SR-IOV callbacks.

Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Sunil Sudhakar Rani <sunrani@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>