add explicit 32-bits of padding to UidTrackingInfo struct am: 8f4e41d679 am: 0223fd80e7 am: ba95810b22 am: c1f778e7da

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

Change-Id: I6d951d590f68837a7b140cd9f274c69d1f1e5499
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>