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-stm32mp/cmd_stm32prog/cmd_stm32prog.c b/arch/arm/mach-stm32mp/cmd_stm32prog/cmd_stm32prog.c
index d2666b9..007f713 100644
--- a/arch/arm/mach-stm32mp/cmd_stm32prog/cmd_stm32prog.c
+++ b/arch/arm/mach-stm32mp/cmd_stm32prog/cmd_stm32prog.c
@@ -79,7 +79,7 @@
 		}
 	}
 
-	if (IS_ENABLED(CONFIG_DM_VIDEO))
+	if (IS_ENABLED(CONFIG_VIDEO))
 		enable_vidconsole();
 
 	data = (struct stm32prog_data *)malloc(sizeof(*data));