Cleaned up some 85xx PCI bugs

* Cleaned up the CDS PCI Config Tables and added NULL entries to
  the end
* Fixed PCIe LAWBAR assignemt to use the cpu-relative address
* Fixed 85xx PCI code to assign powar region sizes based on the
  config values (rather than hard-coding them)
* Fixed the 8548 CDS PCI2 IO to once again have 0 as the base address

Signed-off-by: Andy Fleming <afleming@freescale.com>