Atmel TRNG (True Random Number Generator) block

Required properties:
- compatible : Should be "atmel,at91sam9g45-trng"
- reg : Offset and length of the register set of this block
- interrupts : the interrupt number for the TRNG block
- clocks: should contain the TRNG clk source

Example:

trng@fffcc000 {
	compatible = "atmel,at91sam9g45-trng";
	reg = <0xfffcc000 0x4000>;
	interrupts = <6 IRQ_TYPE_LEVEL_HIGH 0>;
	clocks = <&trng_clk>;
};