Trusty irq interface

Trusty requires non-secure irqs to be forwarded to the secure OS.

Required properties:
- compatible: "android,trusty-irq-v1"

Optional properties:

- interrupt-templates: is an optional property that works together
  with "interrupt-ranges" to specify secure side to kernel IRQs mapping.

  It is a list of entries, each one of which defines a group of interrupts
  having common properties, and has the following format:
    < phandle irq_id_pos [templ_data]>
      phandle - phandle of interrupt controller this template is for
      irq_id_pos - the position of irq id in interrupt specifier array
                   for interrupt controller referenced by phandle.
      templ_data - is an array of u32 values (could be empty) in the same
                   format as interrupt specifier for interrupt controller
                   referenced by phandle but with omitted irq id field.

- interrupt-ranges: list of entries that specifies secure side to kernel
  IRQs mapping.

  Each entry in the "interrupt-ranges" list has the following format:
    <beg end templ_idx>
      beg - first entry in this range
      end - last entry in this range
      templ_idx  - index of entry in "interrupt-templates" property
                   that must be used as a template for all interrupts
                   in this range

Example:
{
	gic: interrupt-controller@50041000 {
		compatible = "arm,gic-400";
		#interrupt-cells = <3>;
		interrupt-controller;
		...
	};
	...
	IPI: interrupt-controller {
		compatible = "android,CustomIPI";
		#interrupt-cells = <1>;
		interrupt-controller;
	};
	...
	trusty {
		compatible = "android,trusty-smc-v1";
		ranges;
		#address-cells = <2>;
		#size-cells = <2>;

		irq {
			compatible = "android,trusty-irq-v1";
			interrupt-templates = <&IPI 0>,
					      <&gic 1 GIC_PPI 0>,
					      <&gic 1 GIC_SPI 0>;
			interrupt-ranges = < 0  15 0>,
					   <16  31 1>,
					   <32 223 2>;
		};
	}
}

Must be a child of the node that provides the trusty std/fast call interface.