scsi: nsp_cs: enable compile-testing on 64-bit

For some reason this driver depends on !64BIT, but it can still be useful
to allow compile-testing on 64-bit machines.

Link: https://lore.kernel.org/r/20191105085609.2338-3-johan@kernel.org


Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>