staging: comedi: amplc_pci230: add whitespace to pci230_boards[]

Add a bit of whitespace to the initializer of `pci230_boards[]` for
aesthetic reasons.

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