wlcore: declare interface combinations

Advertise to the stack that the wlcore driver
supports multiple interfaces for a single device.
This is required in order to be able to run
multirole with mac80211.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Yoni Divinsky <yoni.divinsky@ti.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>