arm64: tegra: Add P2U and PCIe controller nodes to Tegra234 DT

Add P2U (PIPE to UPHY) and PCIe controller nodes to device tree.
The Tegra234 SoC contains 10 PCIe controllers and 24 P2U instances
grouped into three different PHY bricks namely High-Speed IO (HSIO-8 P2Us)
NVIDIA High Speed (NVHS-8 P2Us) and Gigabit Ethernet (GBE-8 P2Us)
respectively.
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>