staging: comedi: comedi_parport: cleanup 'attach' printk's

Convert the printk messages in the 'attach' to dev_printk messages.
Consolidate the attach message into one message after the device
is attached.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>