Merge "Only apply back gesture device config if there are existing insets" into rvc-d1-dev am: f7a4faa2 am: 9205f447

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12272603

Change-Id: I0544e5de31777191d7aaa1b537ec9cfff6f29d99