qlcnic: Restrict VF from configuring any VLAN mode.

o Adapter should allow vlan traffic only for vlans configured on a VF.
  On configuring any vlan mode from VF, adapter will allow any vlan
  traffic to pass for that VF. Do not allow VF to configure this mode.

Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>