staging: comedi: amplc_pci230: remove use of DPRINTK

Use dev_dbg() instead of the DPRINTK macro to output the comedi
debugging information.

The dev_dbg() will prefix the messages appropriately so remove the
"comedi%d: amplc_pci230: " portion and use __func__ to show the
actual function name for debugging.

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>