board: sama5d3xek: 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/configs/sama5d36ek_cmp_mmc_defconfig b/configs/sama5d36ek_cmp_mmc_defconfig
index b6c60cb..7c27812 100644
--- a/configs/sama5d36ek_cmp_mmc_defconfig
+++ b/configs/sama5d36ek_cmp_mmc_defconfig
@@ -55,4 +55,5 @@
 CONFIG_ATMEL_SPI=y
 CONFIG_TIMER=y
 CONFIG_ATMEL_PIT_TIMER=y
-CONFIG_LCD=y
+CONFIG_DM_VIDEO=y
+CONFIG_ATMEL_HLCD=y