Add .gitupstream file

Change-Id: I4fbe058c23ed6ab726df2242bb4b1e26caecce8a
diff --git a/.gitupstream b/.gitupstream
new file mode 100644
index 0000000..77500c6
--- /dev/null
+++ b/.gitupstream
@@ -0,0 +1 @@
+https://git.codelinaro.org/clo/la/platform/hardware/qcom/bootctrl