Phytium SD Host controller

The SD Host Controller on Phytium SoCs provides an interface
for SD and SDIO types of memory cards.

Required properties:
- compatible : should be "phytium,mci".
- reg: mmc controller base registers.
- interrupts : mmc controller interrupt.
- clocks : phandles to input clocks.
- clock-names : should be "phytium_mci_clk".

Examples:
	sdci: sdci@28207c00 {
		compatible = "phytium,sdci";
		reg = <0x0 0x28207c00 0x0 0x100>;
		interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>,
			     <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>,
			     <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>;
		clocks = <&sysclk_600mhz>;
		clock-names = "phytium_sdc_clk";
	};
