update list.txt to jinja2 syntax

Change-Id: I9bf82a34430aaf2fbb06e5676144393fca72f18f
diff --git a/xos/tools/apigen/list.txt b/xos/tools/apigen/list.txt
index 3e115e3..2fee073 100644
--- a/xos/tools/apigen/list.txt
+++ b/xos/tools/apigen/list.txt
@@ -1,3 +1,3 @@
-{% for o in generator.all %}
-{{ o.camel }}
+{% for o in generator.all() %}
+{{ o.camel() }}
 {% endfor %}