lcd parameter calculate setting

		panel-timing {
			clock-frequency = <145200000>;
			hactive = <1920>;
			vactive = <1080>;

			hfront-porch = <120>;
			hback-porch = <120>;
			hsync-len = <40>;

			vfront-porch = <8>;
			vback-porch = <8>;
			vsync-len = <4>;

			hsync-active = <0>;
			vsync-active = <0>;
			de-active = <1>;
			pixelclk-active = <0>;
		};

1. clock-frequency
   PeriodHSPeriodVSrate
2. x+y+z=280
3. x+y+z=20