* Mediatek Universal Asynchronous Receiver/Transmitter (UART)

Required properties:
- compatible should contain:
  * "mediatek,mt8135-uart" for MT8135 compatible UARTS
  * "mediatek,mt8127-uart" for MT8127 compatible UARTS
  * "mediatek,mt8173-uart" for MT8173 compatible UARTS
  * "mediatek,mt6589-uart" for MT6589 compatible UARTS
  * "mediatek,mt6582-uart" for MT6582 compatible UARTS
  * "mediatek,mt6577-uart" for all compatible UARTS (MT8173, MT6589, MT6582, 
	MT6577)

- reg: The base address of the UART register bank.

- interrupts: A single interrupt specifier.

- clocks: Clock driving the hardware.

Example:

	uart0: serial@11006000 {
		compatible = "mediatek,mt6589-uart", "mediatek,mt6577-uart";
		reg = <0x11006000 0x400>;
		interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_LOW>;
		clocks = <&uart_clk>;
	};