Meson SoCs Watchdog timer

Required properties:

- compatible : should be "amlogic,meson6-wdt" or "amlogic,meson8b-wdt"
- reg : Specifies base physical address and size of the registers.

Example:

wdt: watchdog@c1109900 {
	compatible = "amlogic,meson6-wdt";
	reg = <0xc1109900 0x8>;
};
