ixgbe: Add macvlan support for VF

Add infrastructure in the PF driver to support macvlan in the VF driver.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>