staging: comedi: contec_pci_dio: remove function trace messages

The dev_dbg function trace messages in the contec_do_insn_bits
and contec_di_insn_bits functions are just noise. Remove them.

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>