ixgbe: Extend trust to allow guest to set unicast address

When running certain routing protocols like VRRP, VF guests need the
ability to set the unicast address of the interface.  Extend the new ndo
trust feature to let the hypervisor trust a guest to set/update its own
unicast address.

Signed-off-by: Chas Williams <3chas3@gmail.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>