NVIDIA Tegra PCIe controller

Required properties:
- compatible: should be
	"nvidia,tegra124-pcie"
  Details:
  nvidia,tegra124-pcie:
	T124 uses 2 PCIE controllers with 5 lanes in X4_X1 and X2_X1 xbar modes

- nvidia,port0_status: Current board supports port0 slot support status
- nvidia,port1_status: Current board supports port1 slot support status
- nvidia,hot-plug-gpio: Generic Tegra GPIO number used for hotplug event
- nvidia,wake-gpio: Part of connector, used for wake up from LP0
- nvidia,x1-slot-gpio: Board specific, used to enable port1 slot.

Example:

SoC DTSI:
	pcie-controller {
		compatible = "nvidia,tegra124-pcie";
		status = "disabled";
	};

Board DTS:
	pcie-controller {
		nvidia,port0_status = <1>;
		nvidia,port1_status = <1>;
		nvidia,hot-plug-gpio = <&gpio TEGRA_GPIO(O, 1) 0>;
		nvidia,wake-gpio = <&gpio TEGRA_GPIO(DD, 3) 0>;
		nvidia,x1-slot-gpio = <&tca6416 8 0>; /* TCA6416_GPIO(8) */
		status = "okay";
        };
