staging: comedi: pcl812: convert printk messages in pcl812_attach()

Convert the printk messages in this function to dev_{level} mesages.

Remove the ones that are just added noise.

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>