Merge "Co-ex: when face fails use error string" into sc-dev am: 62fdd7cf1b am: 18b39ab0f8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15462988

Change-Id: I978dac6bf74d6e422a89155ad4c764f4e865adbb