Convert CONFIG_VIDEO_LOGO_MAX_SIZE to Kconfig

This converts the following to Kconfig:
   CONFIG_VIDEO_LOGO_MAX_SIZE

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/m53menlo_defconfig b/configs/m53menlo_defconfig
index 4bd98d2..d7e864e 100644
--- a/configs/m53menlo_defconfig
+++ b/configs/m53menlo_defconfig
@@ -126,6 +126,7 @@
 CONFIG_SPLASH_SCREEN_ALIGN=y
 CONFIG_SPLASH_SOURCE=y
 CONFIG_VIDEO_BMP_GZIP=y
+CONFIG_VIDEO_LOGO_MAX_SIZE=0x200000
 CONFIG_BMP_16BPP=y
 CONFIG_WATCHDOG_TIMEOUT_MSECS=8000
 CONFIG_IMX_WATCHDOG=y