board: sama5d2_xplained: Convert to CONFIG_DM_VIDEO

Convert the board to support the video driver model, add the device
tree node, and remove the unnecessary code.

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/sama5d2.dtsi b/arch/arm/dts/sama5d2.dtsi
index b02a602..7520446 100644
--- a/arch/arm/dts/sama5d2.dtsi
+++ b/arch/arm/dts/sama5d2.dtsi
@@ -69,6 +69,13 @@
 			#size-cells = <1>;
 			u-boot,dm-pre-reloc;
 
+			hlcdc: hlcdc@f0000000 {
+				compatible = "atmel,at91sam9x5-hlcdc";
+				reg = <0xf0000000 0x2000>;
+				clocks = <&lcdc_clk>;
+				status = "disabled";
+			};
+
 			pmc: pmc@f0014000 {
 				compatible = "atmel,sama5d2-pmc", "syscon";
 				reg = <0xf0014000 0x160>;