video: Rename CONFIG_DM_VIDEO to CONFIG_VIDEO

Now that all the old code is gone, rename this option. Driver model
migration is now complete.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/meson/Kconfig b/drivers/video/meson/Kconfig
index 0c9ddeb..3c2d72d 100644
--- a/drivers/video/meson/Kconfig
+++ b/drivers/video/meson/Kconfig
@@ -6,7 +6,7 @@
 
 config VIDEO_MESON
 	bool "Enable Amlogic Meson video support"
-	depends on DM_VIDEO
+	depends on VIDEO
 	select DISPLAY
 	help
 	  Enable Amlogic Meson Video Processing Unit video support.