staging: comedi: ni_daq_700: use prefix daq700

Rename a few functions and variables to use the prefix `daq700` instead
of the prefix or suffix `dio700`.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed