Add signed FEC stream core and source buffering

lib/debug_config.c

@@ -136,6 +136,7 @@ static const struct {
     {"radio", DEBUG_CATEGORY_RADIO},
     {"vad", DEBUG_CATEGORY_VAD},
     {"aec", DEBUG_CATEGORY_AEC},
+    {"stream", DEBUG_CATEGORY_STREAM},
     {"all", DEBUG_CATEGORY_ALL},
     {NULL, DEBUG_CATEGORY_NONE}
 };