[PATCH] USB ftdi_sio: reduce device id table clutter

ftdi_sio: Use a single usb_device_id table and detect the type of chip
programatically.  The table also flags devices requiring special
initialization.  The patch makes the driver about 10K smaller and makes
it easier to add new device IDs.
Signed-off-by: NIan Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>