Device-Tree bindings for MediaTek MT5896 SoC based wdt

Required properties:
- compatible	    : Should be
			"mediatek,mt5896-wdt" : for MT5896 SoC
- reg 		    : Specifies base physical address and size of the registers;

Example:

	wdt0 {
		compatible = "mediatek,mt5896-wdt";
		interrupt-parent = <&mtk_intc2_fiq_high>;
		interrupts = <0x0 0x1 0x4>;
		reg = <0 0x1c400600 0 0x200>,
			<0 0x1c020000 0 0x200>;
	};
