Those USB ID's are in freebsd 8.4 which is what 1.8 m0n0wall is based on.
this is the file that you want to check
http://svnweb.freebsd.org/base/release/8.4.0/sys/dev/usb/usbdevs?revision=251259&view=markupwhich is why the device is recognised as a usb device, but there is no driver to attach.
the devices supported are here
http://svnweb.freebsd.org/base/release/8.4.0/sys/dev/usb/wlan/if_run.c?revision=251259&view=markupand it's not on the list, looks like someone added the device id but not a driver to freebsd.
and others have tried to just add the usb ID to the driver and got further, but not to a point it works
http://osdir.com/ml/freebsd-wireless/2012-11/msg00069.html