staging: comedi: cb_pcimdda: remove forward declarations

Move a couple of the functions in order to remove the need for
the forward declarations.

Also, remove the unnecessary comments.

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>
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