net: Add netdev ops for SR-IOV configuration

Add netdev ops for configuring SR-IOV VF devices through the PF driver.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>