docs: add hdf bool for deviste, used to change aspects of the templates

Change-Id: I6ad24252f10211a88d1f98e356bc9da97442f91c
diff --git a/Android.mk b/Android.mk
index 09a7add..ab916c6 100644
--- a/Android.mk
+++ b/Android.mk
@@ -697,7 +697,8 @@
 		$(web_docs_sample_code_flags) \
 		-devsite \
 		-toroot / \
-		-hdf android.whichdoc online
+		-hdf android.whichdoc online \
+		-hdf devsite true
 
 LOCAL_DROIDDOC_CUSTOM_TEMPLATE_DIR:=build/tools/droiddoc/templates-ds