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/colibri_imx7.h b/include/configs/colibri_imx7.h
index 07c26e3..344b266 100644
--- a/include/configs/colibri_imx7.h
+++ b/include/configs/colibri_imx7.h
@@ -200,8 +200,7 @@
 
 #define CONFIG_USBD_HS
 
-#if defined(CONFIG_VIDEO) || defined(CONFIG_DM_VIDEO)
-#define CONFIG_VIDEO_MXS
+#if defined(CONFIG_DM_VIDEO)
 #define CONFIG_VIDEO_LOGO
 #define CONFIG_VIDEO_BMP_LOGO
 #endif