Add a configuration file and hints file for the Alfa Networks Hornet UB
board.

This is another AR9331 board similar to the Carambola2. It has different
ethernet and LED wiring though.

They make a variety of boards that mostly differ on the amount of RAM/flash
available.  Alfa Networks graciously donated a handful of 64MB RAM/16MB flash
boards so I can finish off 802.11s support for the AR93xx chips and do up
a tech demonstration with it.

This is enough to bring up the board.

Tested:

* Alfa networks UB Hornet board - 64MB ram, 16MB flash version.

Thankyou to Alfa Networks for the development boards!

Sponsored by:	Alfa Networks (hardware only)