staging: comedi: addi_apci_3xxx: rename 'ui_MinAcquisitiontimeNs'

Rename this CamelCase boardinfo variable.

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>