Merge "[aapt2] Generate @FlaggedApi annotations" into main am: 5f951b7f6c am: 5fe48781b3 am: ca14f255ca am: acc50fd8a9

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

Change-Id: I1ef4e5e737c490f53007f87d1ad6ab608b66dc6e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>