pci: Make all ones invalid translate address

Function pci_host_bridge_get_paddr() returns zero in case
no mapping for a passed PCI address is found. All ones is
a better choice, since zero may be a legitimate physical
address.

Suggested-by: Andrew Jones <drjones@redhat.com>
Cc: Thomas Huth <thuth@redhat.com>
Cc: Andrew Jones <drjones@redhat.com>
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
[squashed in INVALID_PHYS_ADDR use]
Signed-off-by: Andrew Jones <drjones@redhat.com>