Fix bpfmt issues and add bpfmt to preupload checks

Test: m nothing
Change-Id: I10526a33685335bdd26cc7692815133379d4e0f6
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 928ca03..ff85661 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -1,2 +1,3 @@
 [Builtin Hooks]
 gofmt = true
+bpfmt = true