audiopolicy: engine: remove deprecated APIs

Test: make

Change-Id: Idfcb060095da92adb286706d4eaf9b9a78a8c61a
Signed-off-by: François Gaffie <francois.gaffie@renault.com>
diff --git a/services/audiopolicy/engineconfigurable/src/InputSource.h b/services/audiopolicy/engineconfigurable/src/InputSource.h
index 64b390e..e1865cc 100644
--- a/services/audiopolicy/engineconfigurable/src/InputSource.h
+++ b/services/audiopolicy/engineconfigurable/src/InputSource.h
@@ -59,7 +59,7 @@
 
     /**
      * A Policy element may implement getter/setter function for a given property.
-     * Property may be routing_strategy, audio_stream_type_t, audio_usage_t, audio_source_t
+     * Property may be audio_stream_type_t, audio_usage_t, audio_source_t
      * or a string.
      */
     template <typename Property>