tree cd34a5eea94f5aa8cf1e24be1a87ffd02b91b383
parent e3e90bd0c4f9523813d6726a676e0eea7fd3a101
author Beverly <beverlyt@google.com> 1615841096 -0400
committer Beverly Tai <beverlyt@google.com> 1615841189 +0000

Make AlwaysOnDisplayPolicy a singleton

So we only ever register one SettingsObserver for the
AlwaysOnDisplayPolicy.

Test: manual
Fixes: 182755046
Change-Id: I93245bfd697ccc8653d26abe0f0194053b8655bc