Inside Secure SafeXcel cryptographic engine

Required properties:
- compatible: Should be "inside-secure,safexcel-eip197" or
              "inside-secure,safexcel-eip97".
- reg: Base physical address of the engine and length of memory mapped region.
- interrupts: Interrupt numbers for the rings and engine.
- interrupt-names: Should be "ring0", "ring1", "ring2", "ring3", "eip", "mem".

Optional properties:
- clocks: Reference to the crypto engine clock.

Example:

	crypto: crypto@800000 {
		compatible = "inside-secure,safexcel-eip197";
		reg = <0x800000 0x200000>;
		interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>,
			     <GIC_SPI 54 IRQ_TYPE_LEVEL_HIGH>,
			     <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>,
			     <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>,
			     <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
			     <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>;
		interrupt-names = "mem", "ring0", "ring1", "ring2", "ring3",
				  "eip";
		clocks = <&cpm_syscon0 1 26>;
	};