add support for Hauppauge Broadway

This patch introduces OpenWRT support for the base Hauppauge/PCTV Broadway
platform.  It doesn't deal with the TV tuner or transcoder at this point,
but the core functionality is working (Ethernet, wireless, USB, buttons,
LEDs, etc).

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>

SVN-Revision: 34595