staging: comedi: addi_apci_3501: move range_apci3501_ao to driver

Move the analog output range definition from hwdrv_apci3501.c into
the main driver file.

For aesthetic reasons, rename the range table so it has namespace
associated with the driver.

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