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

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

Change-Id: I59a135e9b44dd533a6cd200c7e1791db56525dd4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>