SystemUI: Add VPN tile

Author: Danny Baumann <dannybaumann@web.de>
Date:   Wed Jul 3 15:12:22 2019 +0200

    SystemUI: Add VPN tile

    Allows quickly connecting/disconnecting to/from VPNs.

Author: Bruno Martins <bgcngm@gmail.com>
Date:   Wed Oct 7 22:51:51 2020 +0100
Edit    Update to Android 11 APIs

Change-Id: Iaa9413bf1071805be8764d92bc5e2dd3131fdaed