commonsys-intf: enable timed rendering vendor metadata

Enable Smomo clients to use timed rendering vendor metadata.

Change-Id: I61fc1b12213c761bed85b9e9cb14c205143bdcce
diff --git a/include/smomo_interface.h b/include/smomo_interface.h
index a655529..322b715 100644
--- a/include/smomo_interface.h
+++ b/include/smomo_interface.h
@@ -75,6 +75,8 @@
 #include <vector>
 #include <string>
 
+#define TIMED_RENDERING_METADATA_FEATURE 1
+
 namespace smomo {
 
 #define SMOMO_LIBRARY_NAME "libsmomo.qti.so"