staging: comedi: amplc_pci230: add whitespace to register values

Several macros are defined for bit-field values within hardware
registers.  They are defined as left-shifted values.  Add some
whitespace around the left-shift operator.

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>