staging: comedi: me_daq: remove {ao,ai}_resoultion_mask

These values can be determined from the {ao,ai}_resolution.

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>