Merge "Only apply back gesture device config if there are existing insets"...

Merge "Only apply back gesture device config if there are existing insets" into rvc-d1-dev am: f7a4faa2 am: 57b3d2aa am: 646b83f0

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

Change-Id: I42d62d5ed2935f33b344c221dd7a330854ee8d8c