Kconfig: Add DEPRECATED option

Add a new option, CONFIG_DEPRECATED, for code that relies on deprecated
functionality and has not been converted past the deadline for
conversion.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/Kconfig b/Kconfig
index a021686..4363088 100644
--- a/Kconfig
+++ b/Kconfig
@@ -20,6 +20,13 @@
 	  This option cannot be enabled. It is used as dependency
 	  for broken and incomplete features.
 
+config DEPRECATED
+	bool
+	help
+	  This option cannot be enabled.  It it used as a dependency for
+	  code that relies on deprecated features that will be removed and
+	  the conversion deadline has passed.
+
 config LOCALVERSION
 	string "Local version - append to U-Boot release"
 	help