staging: comedi: ni_670x: removve unused 'ao_bits'
All the NI 670x boards have 16-bit anaolog output DACs. The 'ao_bits' in the boardinfo is not used so remove it. Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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