staging: comedi: adl_pci9111: use cfc_check_trigger_src

Remove the pci9111_check_trigger_src macro and use the helper
function cfc_check_trigger_src instead.

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>