video: move MXS to Kconfig

Move CONFIG_VIDEO_MXS from board headers to Kconfig
and drop it from obsolete cfb_console driver.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/include/configs/pico-imx6ul.h b/include/configs/pico-imx6ul.h
index 7e36cee..6fed752 100644
--- a/include/configs/pico-imx6ul.h
+++ b/include/configs/pico-imx6ul.h
@@ -135,8 +135,7 @@
  */
 #define CONFIG_BOARD_SIZE_LIMIT		715776
 
-#ifdef CONFIG_VIDEO
-#define CONFIG_VIDEO_MXS
+#ifdef CONFIG_DM_VIDEO
 #define CONFIG_VIDEO_LOGO
 #define CONFIG_VIDEO_BMP_LOGO
 #define MXS_LCDIF_BASE MX6UL_LCDIF1_BASE_ADDR