ARM: tegra: tegra124: Add PCIe support

Add the PCIe controller device tree node and hook up the PCIe PHY from
the XUSB pad controller.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
ARM: tegra: jetson-tk1: Enable PCIe support

Enable both PCIe ports, one of which is connected to an onboard ethernet
chip, whereas the other goes to a miniPCIe slot.

Signed-off-by: Thierry Reding <treding@nvidia.com>
[swarren, fixed PCIe supply property names in DT]
Signed-off-by: Stephen Warren <swarren@nvidia.com>