PCI: rcar: Add Renesas R-Car PCIe driver

This PCIe Host driver currently does not support MSI, so cards fall back to
INTx interrupts.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>

diff --cc drivers/pci/host/Kconfig
Simple merge

diff --cc drivers/pci/host/Makefile
Simple merge

diff --cc drivers/pci/host/pcie-rcar.c
Simple merge