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-tegra/board2.c b/arch/arm/mach-tegra/board2.c
index 1994db0..82d3d33 100644
--- a/arch/arm/mach-tegra/board2.c
+++ b/arch/arm/mach-tegra/board2.c
@@ -134,7 +134,7 @@
 #endif
 
 	/* Init is handled automatically in the driver-model case */
-#if defined(CONFIG_DM_VIDEO)
+#if defined(CONFIG_VIDEO)
 	pin_mux_display();
 #endif
 	/* boot param addr */
@@ -158,7 +158,7 @@
 	pin_mux_usb();
 #endif
 
-#if defined(CONFIG_DM_VIDEO)
+#if defined(CONFIG_VIDEO)
 	board_id = tegra_board_id();
 	err = tegra_lcd_pmic_init(board_id);
 	if (err) {