Add DeviceConfig flags to Privacy Indicators

Restricts Privacy Indicators behind the same flags as Permissions Hub.

When flag is set to false:
* PrivacyItemController is set to not listening (listens to changes in
flag)
* Location icon is reverted back to P behavior
* Location icon is shown in QS Header icons (listens to changes in
flags)
* No privacy chip shown.

We need to listen to changes because most of our views/controllers
persist forever.

Test: manual, change the flag and observe things appear/disappear
Fixes: 131826452
Fixes: 132644949

Change-Id: I329596760f3c06feb2161b077af008da782a50be