Enable clang-format for core/jni

To have consistent code style and avoid format-related comments in code
review, enable clang-format in frameworks/base/core/jni.

Bug: none
Test: repo upload
Change-Id: Ie9e5408d85036dfabae3a9c60b238b4a190da5fc
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 78e72bf..4d1ac0e 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -6,6 +6,7 @@
 clang_format = --commit ${PREUPLOAD_COMMIT} --style file --extensions c,h,cc,cpp
                cmds/hid/
                cmds/input/
+               core/jni/
                libs/input/
 
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