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/mx23evk.h b/include/configs/mx23evk.h
index 1f40d98..bccba5c 100644
--- a/include/configs/mx23evk.h
+++ b/include/configs/mx23evk.h
@@ -26,7 +26,7 @@
 #endif
 
 /* Framebuffer support */
-#ifdef CONFIG_VIDEO
+#ifdef CONFIG_DM_VIDEO
 #define CONFIG_VIDEO_LOGO
 #define CONFIG_SYS_VIDEO_LOGO_MAX_SIZE	(512 << 10)
 #endif