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/configs/pm9263_defconfig b/configs/pm9263_defconfig
index 812128e..637c2b6 100644
--- a/configs/pm9263_defconfig
+++ b/configs/pm9263_defconfig
@@ -66,7 +66,7 @@
 CONFIG_SYS_USB_OHCI_SLOT_NAME="at91sam9263"
 CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS=2
 CONFIG_USB_ATMEL=y
-CONFIG_DM_VIDEO=y
+CONFIG_VIDEO=y
 # CONFIG_VIDEO_BPP32 is not set
 CONFIG_ATMEL_LCD=y
 CONFIG_ATMEL_LCD_BGR555=y