Merge "Allow removing the last app from home controls" into tm-qpr-dev am:...

Merge "Allow removing the last app from home controls" into tm-qpr-dev am: 61e9d75d am: 9461576f am: b8f54f2f am: b1ed1889

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21591532



Change-Id: I3cf03c14e9e85753f54329f3b83c13706107cf25
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>