staging: comedi: mite: remove MDPRINTK macro

This macro is used by the comedi drivers that usee the mite module to
output development function trace messages. These are just added noise.
Remove the messages as well as the macro.

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>