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/include/configs/ls1021aqds.h b/include/configs/ls1021aqds.h
index b349b36..97b8127 100644
--- a/include/configs/ls1021aqds.h
+++ b/include/configs/ls1021aqds.h
@@ -421,9 +421,7 @@
 /*
  * Video
  */
-#define CONFIG_FSL_DCU_FB
-
-#ifdef CONFIG_FSL_DCU_FB
+#ifdef CONFIG_VIDEO_FSL_DCU_FB
 #define CONFIG_CMD_BMP
 #define CONFIG_VIDEO_LOGO
 #define CONFIG_VIDEO_BMP_LOGO