add explicit 32-bits of padding to UidTrackingInfo struct am: 8f4e41d679 am: 0223fd80e7 am: ba95810b22

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/18800447

Change-Id: Ia901393ad3d283fa40c950c4c34f1f30b9b1c676
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>