The wr_nic_wrapper required memory does not fit in the WB Auxiliary space. Consequently, NIC and DIO designs must instantiate it in top-level design.

It fixes an issue regarding NIC memory space because of the Tx/Rx buffer memory should be taken into consideration.

common: Create new functions to initialize the SDB AUX information taking into consideration the interface fabric parameter.

spec: Add generic parameter for the SDB info of an external Wishbone crossbar connected to the auxiliary interface of the WRPC.

- Add generic parameter for the number of the VIC interrupts.
- Add generic parameter for the SDB info of the auxiliary interface of the WRPC.
- Export pps_csync and pps_valid ports from the WRPC.

So far, only SDB devices were connected to the AUX port of WRPC (i.e.
Etherbone, WR_Streamers). In order to be able to connect WR_NIC,
connection of SDB bridge behind the AUX master port was needed.
An additional generic was added to enable this.

Define a specific value for the t_board_fabric_iface type to instanciate the NIC wrapper module.

Otherwise, counter gets crazy when watchdog resets the swcore and feeds all the
endpoints and NIC with ack=1.