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/arch/arm/mach-omap2/am33xx/Kconfig b/arch/arm/mach-omap2/am33xx/Kconfig
index 25e97cf..6c2d46a 100644
--- a/arch/arm/mach-omap2/am33xx/Kconfig
+++ b/arch/arm/mach-omap2/am33xx/Kconfig
@@ -94,7 +94,7 @@
 	select DM
 	select DM_SERIAL
 	select DM_GPIO
-	select DM_VIDEO
+	select VIDEO
 	select PANEL_HX8238D
 
 config TARGET_AM335X_SL50