staging: comedi: cb_pcidas64: Fix checkpath warning

Fix checkpatch.pl warning:
Please use a blank line after function/struct/union/enum declarations

Move macro definition to the top of the file
Aligne macro definitions

Signed-off-by: Anson Jacob <ansonjacob.aj@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>