Limit attribute NPU_MMIO_BAR_BASE_ADDR to Naples-based systems
Limit attribute NPU_MMIO_BAR_BASE_ADDR to Naples-based systems

This commit limits the use of the NPU_MMIO_BAR_BASE_ADDR to the
systems for which it is defined.

Change-Id: I7eab012a84611365e8e6cb6c44b49c4a4ffac8e4
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/17434
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

open-power/hostboot,csmart/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,csmart/hostboot,open-power/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,alvintpwang/hostboot,csmart/hostboot,alvintpwang/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,csmart/hostboot