Merge "Co-ex: when face fails use error string" into sc-dev am: 62fdd7cf1b am: 0c2d4defb7

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

Change-Id: I9082bbb1c5dc3cdfdc8b83586071245147182fcf