USB: Davicom DM9601 usbnet driver

This patch adds a driver for the Davicom DM9601 USB 1.1 10/100Mbps
ethernet adaptor using the usbnet framework.

See http://www.davicom.com.tw/eng/products/dm9601.htm for details.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>