usb: interface authorization: SysFS part of USB interface authorization

This introduces an attribute for each interface to
authorize (1) or deauthorize (0) it:
/sys/bus/usb/devices/INTERFACE/authorized

Signed-off-by: Stefan Koch <skoch@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>