staging: comedi: amplc_pc236: Replace printk calls

Replace the printk calls with dev_info, dev_err, etc.  There were some
consecutive printk calls without newlines which now scnprintf into a
temporary buffer and this bit of code has been factored out into new
function pc236_report_attach().

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