staging: comedi: addi_apci_1500: tidy up PCI Bar 2 register map

Move the PCI Bar 1 register map defines to the main driver source file.
For aesthetics, rename the defines.

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>