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

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

Change-Id: I602bcd413bb2a3afa0f345c60569c6a38efde344
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>