Merge "Allow the user to collapse the notification panel on quick settings" into rvc-dev am: 8e47723834 am: faebbe780e am: fbc2433fc0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12039363

Change-Id: Iedc8201ce5826013ffa2e35046227383a116ef33