libbinder_ndk: Add clang-format presubmit hook.

Originally, this was just done as part of the 'update.sh' script
in libbinder_ndk.

Bug: N/A
Test: manual
Change-Id: I92fca31286df2f063a4ccde70f79688a65c50b39
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 16abc1e..73360a3 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -4,6 +4,7 @@
 [Builtin Hooks Options]
 # Only turn on clang-format check for the following subfolders.
 clang_format = --commit ${PREUPLOAD_COMMIT} --style file --extensions c,h,cc,cpp
+               libs/binder/ndk/
                libs/graphicsenv/
                libs/gui/
                libs/ui/