Qualcomm Technologies, Inc. SDE early splash support

Optional properties:
- qcom,sde-plane-id: reserved plane id
- qcom,plane-name: reserved plane name
- qcom,pipe-early-release: dedicated for splash layer(not early RVC)

Example:

/ {
	qcom,sde-reserved-plane {
		qcom,sde-plane-id@0 {
			reg = <0x0>;
			qcom,plane-name = "vig0";
		};
		qcom,sde-plane-id@1 {
			reg = <0x1>;
			qcom,plane-name = "rgb0";
			qcom,pipe-early-release;
		};
		qcom,sde-plane-id@2 {
			reg = <0x2>;
			qcom,plane-name = "rgb1";
			qcom,pipe-early-release;
		};
		qcom,sde-plane-id@3 {
			reg = <0x3>;
			qcom,plane-name = "rgb2";
			qcom,pipe-early-release;
		};
	};
};
