staging: comedi: addi_apci_1564: correct typo in macro definition

A recent commit introduced a typo in the definition of
APCI1564_DO_CC_INT_DISABLE.  The macro is not use yet, so not a huge deal,
but this patch corrects it.

Signed-off-by: Chase Southwood <chase.southwood@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>