ixgbe: Remove unneeded register writes in VF VLAN setup

The driver is unnecessarily writing values to VLAN control registers.
These writes already done elsewhere and are superfluous here.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>