BCM2835 Random number generator

Required properties:

- compatible : should be "brcm,bcm2835-rng"  or "brcm,bcm-nsp-rng" or
  "brcm,bcm5301x-rng"
- reg : Specifies base physical address and size of the registers.

Example:

rng {
        compatible = "brcm,bcm2835-rng";
        reg = <0x7e104000 0x10>;
};

rng@18033000 {
	compatible = "brcm,bcm-nsp-rng";
	reg = <0x18033000 0x14>;
};