Merge "Use new merge-signatures metalava subcommand" into main am: 4ab9b3c2

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2707495



Change-Id: I5dbbe53433c696abedb2d588888b067a4dd721b4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>