video: Armada XP: Move driver to DM_VIDEO

This patch moves the Armada XP video / LCD driver to DM_VIDEO. With this
move, the legacy interface board_video_init() is removed from the
theadorable board code (only user of this video driver). The support
via DT will be added in a separate patch.

This patch also enables DM_VIDEO for the theadorable board, as this is
needed to not break git bisect'ability.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Anatolij Gustschin <agust@denx.de>
diff --git a/configs/theadorable_debug_defconfig b/configs/theadorable_debug_defconfig
index ac6dfd6..a7d02e9 100644
--- a/configs/theadorable_debug_defconfig
+++ b/configs/theadorable_debug_defconfig
@@ -71,6 +71,5 @@
 CONFIG_DM_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_STORAGE=y
+CONFIG_DM_VIDEO=y
 CONFIG_VIDEO_MVEBU=y
-CONFIG_VIDEO=y
-# CONFIG_VIDEO_SW_CURSOR is not set