Enable cpplint pre-upload repo hook in AOSP.

Test: repo upload . --cbr
Change-Id: I755a0caee718d77d8871d3dedf46e9445c9af441
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 706dfa8..40ddcd1 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -1,3 +1,4 @@
 [Builtin Hooks]
 clang_format = true
+cpplint = true
 pylint = true