Mediatek mt5870 SoC WDT controller

Required properties:

- compatible: must be "mediatek,mt5870-wdt"
- reg: physical base address and length for this controller
- clocks: XTAL


Example:

	wdt{
	   compatible = "mediatek,mt5870-wdt";
	   reg = <0 0x1f006000 0 0x200>;
	};
