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: a23005e3 am: 4814bc64

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

Change-Id: I24fb8b40bb580b540d5cfd3846689fcfee6b9ae5