powerpc/powernv: Add support for p5ioc2 PCI-X and PCIe

This adds support for PCI-X and PCIe on the p5ioc2 IO hub using
OPAL. This includes allocating & setting up TCE tables and config
space access routines.

This also supports fallbacks via RTAS when OPAL is absent, using
legacy TCE format pre-allocated via the device-tree (BML style)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --cc arch/powerpc/platforms/powernv/Makefile
Simple merge

diff --cc arch/powerpc/platforms/powernv/pci-p5ioc2.c
Simple merge

diff --cc arch/powerpc/platforms/powernv/pci.c
Simple merge

diff --cc arch/powerpc/platforms/powernv/pci.h
Simple merge

diff --cc arch/powerpc/platforms/powernv/powernv.h
Simple merge

diff --cc arch/powerpc/platforms/powernv/setup.c
Simple merge