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

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

Change-Id: Id6d570a78ed4e9d057fffe5f15b75234b2c2f4c1