libmemtrack: Add clang-format upload hook am: 8572eb5caa am: 92d6027c30 am: cf5c45f74c

Original change: https://android-review.googlesource.com/c/platform/system/memory/libmemtrack/+/2153820

Change-Id: I292a1ba0e25ca05021be833e60f3cf4f395e1a68
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>