staging: comedi: jr3_pci: remove noisy printk

This driver seems to generate a lot of printk output every time the
driver polls the device.  This may have been useful during development
but shouldn't be used in production.  Just get rid of it all.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>