Staging: comedi: fix printk issue in cb_pcidda.c

This is a patch to the cb_pcidda.c file that fixes up a printk
warning found by the checkpatch.pl tool.

converted printks to dev_printk and Removed unnecessary
printk statements.

Signed-off-by: Ravishankar Karkala Mallikarjunayya <ravishankar.km@greenturtles.in>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>