Convert CONFIG_FSL_DCU_FB to Kconfig

Rename CONFIG_FSL_DCU_FB to CONFIG_VIDEO_FSL_DCU_FB
and convert it to Kconfig.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
Reviewed-by: Stefan Agner <stefan.agner@toradex.com>
Reviewed-by: Alison Wang <alison.wang@nxp.com>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 2069576..6aab8af 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -395,6 +395,13 @@
 	  a special tool which configures the VGA ROM, but the graphics
 	  resolution can be selected in U-Boot.
 
+config VIDEO_FSL_DCU_FB
+	bool "Enable Freescale Display Control Unit"
+	depends on VIDEO
+	help
+	 This enables support for Freescale Display Control Unit (DCU4)
+	 module found on Freescale Vybrid and QorIQ family of SoCs.
+
 config VIDEO_ROCKCHIP
 	bool "Enable Rockchip video support"
 	depends on DM_VIDEO