staging: comedi: ni_labpc: move a couple of the #define's

For aesthetic reasons, move a couple of the #defines in this file
so that the register map defines are first.

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>