powerpc/85xx: introduce SET_PCI_LIODN_BASE, for setting PCI LIODNs

powerpc/85xx: introduce SET_PCI_LIODN_BASE, for setting PCI LIODNs

The liodn for the new PCIE controller included in P5040DS is no longer set
through a register in the guts register block but with one in the PCIE
register block itself.  Update the PCIE CCSR structure to add the new liodn
register and add a new dedicated SET_PCI_LIODN_BASE macro that puts
the liodn in the correct register.

Signed-off-by: Laurentiu Tudor <[email protected]>
Signed-off-by: Timur Tabi <[email protected]>
Signed-off-by: Andy Fleming <[email protected]>