net/sfc/base: add EVB module vSwitch/vPort/vAdaptor ops

net/sfc/base: add EVB module vSwitch/vPort/vAdaptor ops

Implement functions to allocate and free vSwitch, vPort and vAdaptor.
Also, implement functions to add and delete vPort MAC address and EVB
port assign.

Most of the efx_evb_ops_t functions take vSwitch ID as a parameter for
future enhancements. Currently, firmware doesn't implement vSwitch
identifier and hence this parameter is unused for EF10 architecture
implementation.

Signed-off-by: Gautam Dawar <gdawar@solarflare.com>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>