staging: comedi: addi_apci_1564: move counter register defines to driver

Move the defines for the counter registers from the included source
file to the main driver source file.

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