enic: Add SRIOV support

enic: Add SRIOV support

This patch adds support to enable SRIOV on enic devices. Enic SRIOV VF's are dynamic vnics and will use the same driver code as dynamic vnics.

(cherry picked from commit 8749b427f213e14303dfef4c1b9770f05f67916d)
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: Sujith Sankar <ssujith@cisco.com>
Signed-off-by: Christian Benvenuti <benve@cisco.com>
Signed-off-by: David Wang <dwang2@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Joe Jin <joe.jin@oracle.com>