staging: comedi: adv_pci1724: rename ao_ranges_1724

For aesthetics, rename the analog output comedi_lrange table so
it has namespace associated with the driver.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>