Add UpsideDownCake to aapt2 codenames and android.os.Build am: e422b7da am: 748236fd

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21423290



Change-Id: I3866ad5981636d1b978a1abee66d5a01b5e2a061
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>