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

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

Change-Id: Ib3f39f77fe3d1d4fba0677d2adfeda5da8ce891e