Try this for testing, if the OpenWRT can "see" both interfaces:
iw list |grep phy0 && iw list |grep phy1
This is, if everything is fine, show two lines:
Wiphy phy0
Wiphy phy1
Those are the physical wireless network interfaces. Try creating a new virtual interface using both nics as parents:
iw phy phy0 interface add new0 type managed
and
iw phy phy1 interface add new1 type managed
you should also be able to create them using these:
iw dev wlan0 interface add new0 type managed
iw dev wlan1 interface add new1 type managed
Please, reply with your findings :)
//Arakiz