NVIDIA Tegra Flow Controller

Required properties:
- compatible: Should be "nvidia,tegra<chip>-flowctrl"
- reg: Should contain one register range (address and length)

Example:

	flow-controller@60007000 {
		compatible = "nvidia,tegra20-flowctrl";
		reg = <0x60007000 0x1000>;
	};

Add NVIDIA Tegra flow controller bindings
of: Add NVIDIA Tegra flow controller bindings

Add device tree bindings for the flow controller found on NVIDIA Tegra
SoCs.

Signed-off-by: Thierry Reding <3055038c414aef68bf32c33b8118623e7554e0f2@nvidia.com>
Signed-off-by: Stephen Warren <5ef2a23ba3aff51d1cfc8c113c1ec34b608b3b13@nvidia.com>
