Add PREUPLOAD.cfg file

The PREUPLOAD.cfg file requires enabled the preupload clang style
check.

Bug: None
Test: repo upload

Change-Id: Ic0867069da15b971d5f6130b4cdd1f213fd99625
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
new file mode 100644
index 0000000..6b7fd71
--- /dev/null
+++ b/PREUPLOAD.cfg
@@ -0,0 +1,2 @@
+[Builtin Hooks]
+clang_format = true