[automerge] Revert "[DO NOT MERGE] Keyguard was hiding occluding activities" 2p: d7fe18428f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17145222

Change-Id: Iba6f17c04043eaaa6ead6195723985cd9476d1c2