[PATCH v3] powerpc/85xx: Add P2020DS board support

[Liu Dave-R63238]

> +		L2: l2-cache-controller at 20000 {
> +			compatible = "fsl,p2020-l2-cache-controller";
> +			reg = <0x20000 0x1000>;
> +			cache-line-size = <32>;	// 32 bytes
> +			cache-size = <0x100000>; // L2, 1M
> +			interrupt-parent = <&mpic>;
> +			interrupts = <16 2>;
> +		};

One nit --here should be 512KB L2 cache

> +		usb at 22000 {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			compatible = "fsl-usb2-mph";
> +			reg = <0x22000 0x1000>;
> +			interrupt-parent = <&mpic>;
> +			interrupts = <28 0x2>;
> +			phy_type = "ulpi";
> +		};

It should be "fsl-usb2-dr"