The RTC on the M1575 ULI chipset requires a dummy read before
we are able to talk to the RTC.  We accomplish this by adding a
second memory region to the PHB the ULI is on and read from it.

The second region is added to maintain compatiabilty with Linux's
view of the PCI memory map.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>