Convert CONFIG_LCD to Kconfig

This converts the following to Kconfig:
   CONFIG_LCD

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 866fafd..64757ad7 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -443,4 +443,12 @@
 	  model. Video drivers typically provide a colour text console and
 	  cursor.
 
+config LCD
+	bool "Enable legacy LCD support"
+	help
+	  Define this to enable LCD support (for output to LCD display).
+	  You will also need to select an LCD driver using an additional
+	  CONFIG option. See the README for details. Drives which have been
+	  converted to driver model will instead used CONFIG_DM_VIDEO.
+
 endmenu