wifi: rtl8xxxu: support multiple interfaces in {add,remove}_interface()

Add a custom struct to store in vif->drv_priv with a reference to
port_num and fill it when a new interface is added. Choose a free
port_num for the newly added interface.

As we only want to support AP mode/sending beacons on port 0, only change
the beacon settings if a new interface is actually assigned to port 0.

Call set_linktype() and set_mac() with the appropriate port_num.

Signed-off-by: Martin Kaistra <[email protected]>
Reviewed-by: Ping-Ke Shih <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://msgid.link/[email protected]

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