Merge "[aapt2] Generate @FlaggedApi annotations" into main am: 5f951b7f6c am: 5fe48781b3 am: ca14f255ca

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2783692

Change-Id: I70f0bb8e25292a9d04ccd970854b4ed3a62e33ab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>