Implement the framework for Enterprise Virtual Briding (EVB) module.
SR-IOV augments the software virtual switch with NIC capabilities
supported from EVB module.
Further patches will add APIs to create and destroy EVB switching
hierarchy required for SR-IOV and APIs to set vPort properties like MAC,
VLAN etc.
Signed-off-by: Gautam Dawar <gdawar@solarflare.com> Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>