Meson GXBB SoCs Watchdog timer

Required properties:

- compatible : should be "amlogic,meson-gxbb-wdt"
- reg : Specifies base physical address and size of the registers.
- clocks : Should be a phandle to the Watchdog clock source, for GXBB the xtal
	   is the default clock source.

Example:

wdt: watchdog@98d0 {
	compatible = "amlogic,meson-gxbb-wdt";
	reg = <0 0x98d0 0x0 0x10>;
	clocks = <&xtal>;
};
