p54usb: add USB ID for Linksys WUSB54G ver 2

Based on report from Cavan Carroll <cavancarroll@hotmail.com>:

	http://bugzilla.kernel.org/show_bug.cgi?id=9863

Cc: Cavan Carroll <cavancarroll@hotmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>