Add .gitupstream file

Change-Id: I027289d23f9479e5a3d140c614493b2e356ad813
diff --git a/.gitupstream b/.gitupstream
new file mode 100644
index 0000000..d427a82
--- /dev/null
+++ b/.gitupstream
@@ -0,0 +1 @@
+https://git.codelinaro.org/clo/la/platform/external/ant-wireless/ant_service