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NVIDIA Tegra114 SPI controller.

Required properties:
- compatible : should be "nvidia,tegra114-spi".
- reg: Should contain SPI registers location and length.
- interrupts: Should contain SPI interrupts.
- nvidia,dma-request-selector : The Tegra DMA controller's phandle and
  request selector for this SPI controller.
- clocks : Must contain an entry for each entry in clock-names.
  See ../clocks/clock-bindings.txt for details.
- clock-names : Must include the following entries:
  - spi

Recommended properties:
- spi-max-frequency: Definition as per
                     Documentation/devicetree/bindings/spi/spi-bus.txt
Example:

spi@7000d600 {
	compatible = "nvidia,tegra114-spi";
	reg = <0x7000d600 0x200>;
	interrupts = <0 82 0x04>;
	nvidia,dma-request-selector = <&apbdma 16>;
	spi-max-frequency = <25000000>;
	#address-cells = <1>;
	#size-cells = <0>;
	clocks = <&tegra_car 44>;
	clock-names = "spi";
	status = "disabled";
};

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