staging: comedi: ni_daq_dio24: remove pcmcia_driver suspend/resume

The pcmcia_driver suspend and resume functions in this driver
don't do anything. Since they are optional just remove them.

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>