Merge "Force-clear nav bar flags when phone finishes booting." into rvc-dev...

Merge "Force-clear nav bar flags when phone finishes booting." into rvc-dev am: b236787b am: eb688524 am: 8bce6286 am: db8c8527

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11813213

Change-Id: I54149e5ec2dc891a23414314013df35210a2b558