Add .gitupstream file

Change-Id: I72d057b35548cd143932398378293481e4e908b3
diff --git a/.gitupstream b/.gitupstream
new file mode 100644
index 0000000..91f5c33
--- /dev/null
+++ b/.gitupstream
@@ -0,0 +1 @@
+https://git.codelinaro.org/clo/la/platform/external/ant-wireless/ant_client