Staging: comedi: ni_atmio16d: printk fixups

Fix improper use of printks in this driver.  Most are
debug messages under a DEBUG #ifdef, a few are info/warnings
that should get logged for driver error conditions.

Signed-off-by: Bruce Jones <brucej@linux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>