Merge "Only apply back gesture device config if there are existing insets" into rvc-d1-dev am: f7a4faa241 am: 9205f447b5 am: 96919959f8

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

Change-Id: I3a683eac14844ae280b2f3cb923d3270687a263b