[automerger skipped] Merge "Revert "On device lockdown, always show the keyguard"" into udc-dev am: b708c4f32e -s ours am: 4e40bd703b -s ours

am skip reason: Merged-In I9a7c5e1acadabd4484e58573331f98dba895f2a2 with SHA-1 100ae42365 is already in history. Merged-In was found from reverted change.

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24762427

Change-Id: Iac12d592b5facfc6db49407644d385b2a089287d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>