PCI: tegra194: Add Tegra234 PCIe support

Add support for Synopsys DesignWare core IP based PCIe host controllers
present in the Tegra234 SoC.

Link: https://lore.kernel.org/r/20220721142052.25971-17-vidyas@nvidia.com


Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>