staging: comedi: pcmad: remove unnecessary includes

This driver does not use interrupts and the comedi core handles the
allocation of the io resource so these includes are not required.

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>