Config.in: Add BR2_DEPRECATED_SINCE_2016_08

In preparation for new deprecated features/symbols.

Signed-off-by: Julien Floret <julien.floret@6wind.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Config.in

@@ -385,6 +385,10 @@ config BR2_DEPRECATED_SINCE_2016_05
 	bool
 	default y
 
+config BR2_DEPRECATED_SINCE_2016_08
+	bool
+	default y
+
 endif
 
 config BR2_ENABLE_DEBUG